64868081 has 4 divisors (see below), whose sum is σ = 65967600. Its totient is φ = 63768564.

The previous prime is 64868077. The next prime is 64868093. The reversal of 64868081 is 18086846.

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.

It is a cyclic number.

It is not a de Polignac number, because 64868081 - 2² = 64868077 is a prime.

It is a super-2 number, since 2×64868081² = 8415735865245122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64868021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549671 + ... + 549788.

It is an arithmetic number, because the mean of its divisors is an integer number (16491900).

Almost surely, 2^64868081 is an apocalyptic number.

It is an amenable number.

64868081 is a deficient number, since it is larger than the sum of its proper divisors (1099519).

64868081 is a wasteful number, since it uses less digits than its factorization.

64868081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099518.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 64868081 is about 8054.0723239862. The cubic root of 64868081 is about 401.8003864471.

The spelling of 64868081 in words is "sixty-four million, eight hundred sixty-eight thousand, eighty-one".