78855625 has 20 divisors (see below), whose sum is σ = 99108900. Its totient is φ = 62720000.

The previous prime is 78855607. The next prime is 78855629. The reversal of 78855625 is 52655887.

It can be written as a sum of positive squares in 10 ways, for example, as 50168889 + 28686736 = 7083^2 + 5356^2 .

It is not a de Polignac number, because 78855625 - 2¹⁵ = 78822857 is a prime.

Its product of digits (672000) is a multiple of the sum of its prime factors (750).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855629) 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, 175401 + ... + 175849.

It is an arithmetic number, because the mean of its divisors is an integer number (4955445).

Almost surely, 2^78855625 is an apocalyptic number.

It is an amenable number.

78855625 is a deficient number, since it is larger than the sum of its proper divisors (20253275).

78855625 is an equidigital number, since it uses as much as digits as its factorization.

78855625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 735 counting only the distinct ones).

The product of its digits is 672000, while the sum is 46.

The square root of 78855625 is about 8880.0689749573. The cubic root of 78855625 is about 428.8224950868.

The spelling of 78855625 in words is "seventy-eight million, eight hundred fifty-five thousand, six hundred twenty-five".