64568881 has 4 divisors (see below), whose sum is σ = 69535732. Its totient is φ = 59602032.

The previous prime is 64568869. The next prime is 64568899. The reversal of 64568881 is 18886546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4661281 + 59907600 = 2159^2 + 7740^2 .

It is a cyclic number.

It is not a de Polignac number, because 64568881 - 2⁵ = 64568849 is a prime.

It is a super-2 number, since 2×64568881² = 8338280787184322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64568831) 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, 2483406 + ... + 2483431.

It is an arithmetic number, because the mean of its divisors is an integer number (17383933).

Almost surely, 2^64568881 is an apocalyptic number.

It is an amenable number.

64568881 is a deficient number, since it is larger than the sum of its proper divisors (4966851).

64568881 is a wasteful number, since it uses less digits than its factorization.

64568881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966850.

The product of its digits is 368640, while the sum is 46.

The square root of 64568881 is about 8035.4764015583. The cubic root of 64568881 is about 401.1816744263.

The spelling of 64568881 in words is "sixty-four million, five hundred sixty-eight thousand, eight hundred eighty-one".