78724625 has 24 divisors (see below), whose sum is σ = 114297768. Its totient is φ = 53978400.

The previous prime is 78724621. The next prime is 78724627. The reversal of 78724625 is 52642787.

It can be written as a sum of positive squares in 4 ways, for example, as 9102289 + 69622336 = 3017^2 + 8344^2 .

It is not a de Polignac number, because 78724625 - 2² = 78724621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78724621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (4762407).

Almost surely, 2^78724625 is an apocalyptic number.

It is an amenable number.

78724625 is a deficient number, since it is larger than the sum of its proper divisors (35573143).

78724625 is a wasteful number, since it uses less digits than its factorization.

78724625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12882 (or 12865 counting only the distinct ones).

The product of its digits is 188160, while the sum is 41.

The square root of 78724625 is about 8872.6898401781. The cubic root of 78724625 is about 428.5849010315.

The spelling of 78724625 in words is "seventy-eight million, seven hundred twenty-four thousand, six hundred twenty-five".