64776872 has 16 divisors (see below), whose sum is σ = 121683060. Its totient is φ = 32328064.

The previous prime is 64776869. The next prime is 64776889. The reversal of 64776872 is 27867746.

It can be written as a sum of positive squares in 2 ways, for example, as 55860676 + 8916196 = 7474^2 + 2986^2 .

It is a super-2 number, since 2×64776872² = 8392086292208768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813 + ... + 11724.

Almost surely, 2^64776872 is an apocalyptic number.

It is an amenable number.

64776872 is a deficient number, since it is larger than the sum of its proper divisors (56906188).

64776872 is a wasteful number, since it uses less digits than its factorization.

64776872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100 (or 15096 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The square root of 64776872 is about 8048.4080413458. The cubic root of 64776872 is about 401.6119784208.

The spelling of 64776872 in words is "sixty-four million, seven hundred seventy-six thousand, eight hundred seventy-two".