78989825 has 12 divisors (see below), whose sum is σ = 98817708. Its totient is φ = 62630400.

The previous prime is 78989819. The next prime is 78989863. The reversal of 78989825 is 52898987.

It can be written as a sum of positive squares in 6 ways, for example, as 25816561 + 53173264 = 5081^2 + 7292^2 .

It is not a de Polignac number, because 78989825 - 2¹⁴ = 78973441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11156 + ... + 16805.

It is an arithmetic number, because the mean of its divisors is an integer number (8234809).

Almost surely, 2^78989825 is an apocalyptic number.

It is an amenable number.

78989825 is a deficient number, since it is larger than the sum of its proper divisors (19827883).

78989825 is a wasteful number, since it uses less digits than its factorization.

78989825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28084 (or 28079 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 56.

The square root of 78989825 is about 8887.6220104143. The cubic root of 78989825 is about 429.0656202655.

It can be divided in two parts, 7898982 and 5, that added together give a palindrome (7898987).

The spelling of 78989825 in words is "seventy-eight million, nine hundred eighty-nine thousand, eight hundred twenty-five".