78660625 has 20 divisors (see below), whose sum is σ = 99168256. Its totient is φ = 62370000.

The previous prime is 78660623. The next prime is 78660641. The reversal of 78660625 is 52606687.

It is not a de Polignac number, because 78660625 - 2¹ = 78660623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78660623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 78880 + ... + 79870.

Almost surely, 2^78660625 is an apocalyptic number.

It is an amenable number.

78660625 is a deficient number, since it is larger than the sum of its proper divisors (20507631).

78660625 is an equidigital number, since it uses as much as digits as its factorization.

78660625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78660625 is about 8869.0825342873. The cubic root of 78660625 is about 428.4687286986.

The spelling of 78660625 in words is "seventy-eight million, six hundred sixty thousand, six hundred twenty-five".