64879881 has 32 divisors (see below), whose sum is σ = 98150400. Its totient is φ = 37778880.

The previous prime is 64879877. The next prime is 64879883. The reversal of 64879881 is 18897846.

It is not a de Polignac number, because 64879881 - 2² = 64879877 is a prime.

It is a super-2 number, since 2×64879881² = 8418797917148322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64879883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91155 + ... + 91863.

It is an arithmetic number, because the mean of its divisors is an integer number (3067200).

Almost surely, 2^64879881 is an apocalyptic number.

It is an amenable number.

64879881 is a deficient number, since it is larger than the sum of its proper divisors (33270519).

64879881 is a wasteful number, since it uses less digits than its factorization.

64879881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its digits is 774144, while the sum is 51.

The square root of 64879881 is about 8054.8048393490. The cubic root of 64879881 is about 401.8247484909.

The spelling of 64879881 in words is "sixty-four million, eight hundred seventy-nine thousand, eight hundred eighty-one".