78724564 has 12 divisors (see below), whose sum is σ = 138014100. Its totient is φ = 39291968.

The previous prime is 78724559. The next prime is 78724571. The reversal of 78724564 is 46542787.

It can be written as a sum of positive squares in 2 ways, for example, as 3763600 + 74960964 = 1940^2 + 8658^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78724564.

It is a congruent number.

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, 15019 + ... + 19570.

It is an arithmetic number, because the mean of its divisors is an integer number (11501175).

Almost surely, 2^78724564 is an apocalyptic number.

It is an amenable number.

78724564 is a deficient number, since it is larger than the sum of its proper divisors (59289536).

78724564 is a wasteful number, since it uses less digits than its factorization.

78724564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35162 (or 35160 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 78724564 is about 8872.6864026629. The cubic root of 78724564 is about 428.5847903347.

The spelling of 78724564 in words is "seventy-eight million, seven hundred twenty-four thousand, five hundred sixty-four".