64778564 has 12 divisors (see below), whose sum is σ = 116426604. Its totient is φ = 31513824.

The previous prime is 64778563. The next prime is 64778569. The reversal of 64778564 is 46587746.

It is a happy number.

64778564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43692100 + 21086464 = 6610^2 + 4592^2 .

It is not an unprimeable number, because it can be changed into a prime (64778563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218699 + ... + 218994.

It is an arithmetic number, because the mean of its divisors is an integer number (9702217).

Almost surely, 2^64778564 is an apocalyptic number.

It is an amenable number.

64778564 is a deficient number, since it is larger than the sum of its proper divisors (51648040).

64778564 is a wasteful number, since it uses less digits than its factorization.

64778564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437734 (or 437732 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The square root of 64778564 is about 8048.5131546143. The cubic root of 64778564 is about 401.6154751501.

The spelling of 64778564 in words is "sixty-four million, seven hundred seventy-eight thousand, five hundred sixty-four".