78620625 has 50 divisors (see below), whose sum is σ = 146854554. Its totient is φ = 41904000.

The previous prime is 78620617. The next prime is 78620629. The reversal of 78620625 is 52602687.

78620625 is a `hidden beast` number, since 7 + 8 + 6 + 20 + 625 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 48776256 + 29844369 = 6984^2 + 5463^2 .

It is not a de Polignac number, because 78620625 - 2³ = 78620617 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78620625.

It is not an unprimeable number, because it can be changed into a prime (78620629) by changing a digit.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 49849 + ... + 51401.

Almost surely, 2^78620625 is an apocalyptic number.

78620625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78620625 is a deficient number, since it is larger than the sum of its proper divisors (68233929).

78620625 is an equidigital number, since it uses as much as digits as its factorization.

78620625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585 (or 1561 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 78620625 is about 8866.8272228571. The cubic root of 78620625 is about 428.3960889881.

The spelling of 78620625 in words is "seventy-eight million, six hundred twenty thousand, six hundred twenty-five".