78239425 has 12 divisors (see below), whose sum is σ = 105836976. Its totient is φ = 56901200.

The previous prime is 78239417. The next prime is 78239449. The reversal of 78239425 is 52493287.

It is not a de Polignac number, because 78239425 - 2³ = 78239417 is a prime.

It is a super-2 number, since 2×78239425² = 12242815248661250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141979 + ... + 142528.

It is an arithmetic number, because the mean of its divisors is an integer number (8819748).

Almost surely, 2^78239425 is an apocalyptic number.

It is an amenable number.

78239425 is a deficient number, since it is larger than the sum of its proper divisors (27597551).

78239425 is a wasteful number, since it uses less digits than its factorization.

78239425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284528 (or 284523 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 78239425 is about 8845.3052519401. The cubic root of 78239425 is about 427.7025931221.

The spelling of 78239425 in words is "seventy-eight million, two hundred thirty-nine thousand, four hundred twenty-five".