78531972 has 24 divisors (see below), whose sum is σ = 183404256. Its totient is φ = 26154048.

The previous prime is 78531953. The next prime is 78531989. The reversal of 78531972 is 27913587.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16128 + ... + 20424.

It is an arithmetic number, because the mean of its divisors is an integer number (7641844).

Almost surely, 2^78531972 is an apocalyptic number.

It is an amenable number.

78531972 is an abundant number, since it is smaller than the sum of its proper divisors (104872284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78531972 is a wasteful number, since it uses less digits than its factorization.

78531972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5827 (or 5825 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 78531972 is about 8861.8266739990. The cubic root of 78531972 is about 428.2350079216.

The spelling of 78531972 in words is "seventy-eight million, five hundred thirty-one thousand, nine hundred seventy-two".