64570081 has 4 divisors (see below), whose sum is σ = 64606464. Its totient is φ = 64533700.

The previous prime is 64570067. The next prime is 64570091. The reversal of 64570081 is 18007546.

64570081 is nontrivially palindromic in base 3.

64570081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 3281-st star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18007546 = 2 ⋅9003773.

It is a cyclic number.

It is not a de Polignac number, because 64570081 - 2⁹ = 64569569 is a prime.

It is a super-2 number, since 2×64570081² = 8338590720693122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

64570081 is a nontrivial repdigit in base 3.

It is a plaindrome in base 3 and base 9.

It is a nialpdrome in base 3.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (64570021) by changing a digit.

It is a nontrivial repunit in base 3.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15385 + ... + 19126.

It is an arithmetic number, because the mean of its divisors is an integer number (16151616).

Almost surely, 2^64570081 is an apocalyptic number.

It is an amenable number.

64570081 is a deficient number, since it is larger than the sum of its proper divisors (36383).

64570081 is a wasteful number, since it uses less digits than its factorization.

64570081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36382.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 64570081 is about 8035.5510700885. The cubic root of 64570081 is about 401.1841597052.

The spelling of 64570081 in words is "sixty-four million, five hundred seventy thousand, eighty-one".