78120425 has 12 divisors (see below), whose sum is σ = 98513040. Its totient is φ = 61435920.

The previous prime is 78120359. The next prime is 78120437. The reversal of 78120425 is 52402187.

It is not a de Polignac number, because 78120425 - 2²² = 73926121 is a prime.

It is a super-2 number, since 2×78120425² = 12205601604361250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25007 + ... + 27956.

It is an arithmetic number, because the mean of its divisors is an integer number (8209420).

Almost surely, 2^78120425 is an apocalyptic number.

It is an amenable number.

78120425 is a deficient number, since it is larger than the sum of its proper divisors (20392615).

78120425 is a wasteful number, since it uses less digits than its factorization.

78120425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53032 (or 53027 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 78120425 is about 8838.5759599610. The cubic root of 78120425 is about 427.4856418237.

The spelling of 78120425 in words is "seventy-eight million, one hundred twenty thousand, four hundred twenty-five".