64777864 has 16 divisors (see below), whose sum is σ = 123123420. Its totient is φ = 31944960.

The previous prime is 64777831. The next prime is 64777873. The reversal of 64777864 is 46877746.

It can be written as a sum of positive squares in 2 ways, for example, as 56881764 + 7896100 = 7542^2 + 2810^2 .

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, 54877 + ... + 56044.

Almost surely, 2^64777864 is an apocalyptic number.

It is an amenable number.

64777864 is a deficient number, since it is larger than the sum of its proper divisors (58345556).

64777864 is a wasteful number, since it uses less digits than its factorization.

64777864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111000 (or 110996 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 49.

The square root of 64777864 is about 8048.4696682040. The cubic root of 64777864 is about 401.6140285201.

It can be divided in two parts, 6477 and 7864, that added together give a palindrome (14341).

The spelling of 64777864 in words is "sixty-four million, seven hundred seventy-seven thousand, eight hundred sixty-four".