78015625 has 14 divisors (see below), whose sum is σ = 97537814. Its totient is φ = 62400000.

The previous prime is 78015617. The next prime is 78015643. The reversal of 78015625 is 52651087.

It can be written as a sum of positive squares in 7 ways, for example, as 77070841 + 944784 = 8779^2 + 972^2 .

It is not a de Polignac number, because 78015625 - 2³ = 78015617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13129 + ... + 18121.

Almost surely, 2^78015625 is an apocalyptic number.

It is an amenable number.

78015625 is a deficient number, since it is larger than the sum of its proper divisors (19522189).

78015625 is an frugal number, since it uses more digits than its factorization.

78015625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023 (or 4998 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 78015625 is about 8832.6454134648. The cubic root of 78015625 is about 427.2943963042.

The spelling of 78015625 in words is "seventy-eight million, fifteen thousand, six hundred twenty-five".