78500025 has 18 divisors (see below), whose sum is σ = 140602670. Its totient is φ = 41866560.

The previous prime is 78500021. The next prime is 78500027. The reversal of 78500025 is 52000587.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 71289 + 78428736 = 267^2 + 8856^2 .

It is not a de Polignac number, because 78500025 - 2² = 78500021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78500021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 174220 + ... + 174669.

Almost surely, 2^78500025 is an apocalyptic number.

78500025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78500025 is a deficient number, since it is larger than the sum of its proper divisors (62102645).

78500025 is a wasteful number, since it uses less digits than its factorization.

78500025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348905 (or 348897 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 78500025 is about 8860.0239841662. The cubic root of 78500025 is about 428.1769310263.

The spelling of 78500025 in words is "seventy-eight million, five hundred thousand, twenty-five".