78990925 has 54 divisors (see below), whose sum is σ = 116050298. Its totient is φ = 53007360.

The previous prime is 78990917. The next prime is 78990937. The reversal of 78990925 is 52909987.

It can be written as a sum of positive squares in 27 ways, for example, as 68376361 + 10614564 = 8269^2 + 3258^2 .

It is not a de Polignac number, because 78990925 - 2³ = 78990917 is a prime.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2723811 + ... + 2723839.

Almost surely, 2^78990925 is an apocalyptic number.

It is an amenable number.

78990925 is a deficient number, since it is larger than the sum of its proper divisors (37059373).

78990925 is a wasteful number, since it uses less digits than its factorization.

78990925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 78990925 is about 8887.6838940187. The cubic root of 78990925 is about 429.0676119566.

The spelling of 78990925 in words is "seventy-eight million, nine hundred ninety thousand, nine hundred twenty-five".