78412925 has 18 divisors (see below), whose sum is σ = 103297518. Its totient is φ = 59034880.

The previous prime is 78412861. The next prime is 78412931. The reversal of 78412925 is 52921487.

It can be written as a sum of positive squares in 9 ways, for example, as 3728761 + 74684164 = 1931^2 + 8642^2 .

It is not a de Polignac number, because 78412925 - 2⁶ = 78412861 is a prime.

It is a super-2 number, since 2×78412925² = 12297173614111250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1799 + ... + 12651.

It is an arithmetic number, because the mean of its divisors is an integer number (5738751).

Almost surely, 2^78412925 is an apocalyptic number.

It is an amenable number.

78412925 is a deficient number, since it is larger than the sum of its proper divisors (24884593).

78412925 is a wasteful number, since it uses less digits than its factorization.

78412925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10897 (or 10875 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 78412925 is about 8855.1072833704. The cubic root of 78412925 is about 428.0185106415.

The spelling of 78412925 in words is "seventy-eight million, four hundred twelve thousand, nine hundred twenty-five".