64782864 has 60 divisors (see below), whose sum is σ = 182060892. Its totient is φ = 21504000.

The previous prime is 64782853. The next prime is 64782871. The reversal of 64782864 is 46828746.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 6718464 = 7620^2 + 2592^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39664 + ... + 41264.

Almost surely, 2^64782864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64782864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91030446).

64782864 is an abundant number, since it is smaller than the sum of its proper divisors (117278028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64782864 is a wasteful number, since it uses less digits than its factorization.

64782864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896 (or 1887 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 64782864 is about 8048.7802802661. The cubic root of 64782864 is about 401.6243613630.

The spelling of 64782864 in words is "sixty-four million, seven hundred eighty-two thousand, eight hundred sixty-four".