78686025 has 48 divisors (see below), whose sum is σ = 143228928. Its totient is φ = 37800000.

The previous prime is 78686021. The next prime is 78686033. The reversal of 78686025 is 52068687.

It is not a de Polignac number, because 78686025 - 2² = 78686021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78686021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104400 + ... + 105150.

It is an arithmetic number, because the mean of its divisors is an integer number (2983936).

Almost surely, 2^78686025 is an apocalyptic number.

78686025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78686025 is a deficient number, since it is larger than the sum of its proper divisors (64542903).

78686025 is a wasteful number, since it uses less digits than its factorization.

78686025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 78686025 is about 8870.5143593819. The cubic root of 78686025 is about 428.5148421321.

It can be divided in two parts, 786860 and 25, that added together give a triangular number (786885 = T₁₂₅₄).

The spelling of 78686025 in words is "seventy-eight million, six hundred eighty-six thousand, twenty-five".