51279972 has 24 divisors (see below), whose sum is σ = 124856256. Its totient is φ = 16350048.

The previous prime is 51279959. The next prime is 51279979. The reversal of 51279972 is 27997215.

It is not an unprimeable number, because it can be changed into a prime (51279979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92623 + ... + 93174.

It is an arithmetic number, because the mean of its divisors is an integer number (5202344).

Almost surely, 2^51279972 is an apocalyptic number.

It is an amenable number.

51279972 is an abundant number, since it is smaller than the sum of its proper divisors (73576284).

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

51279972 is a wasteful number, since it uses less digits than its factorization.

51279972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185827 (or 185825 counting only the distinct ones).

The product of its digits is 79380, while the sum is 42.

The square root of 51279972 is about 7161.0035609543. The cubic root of 51279972 is about 371.5203379627.

The spelling of 51279972 in words is "fifty-one million, two hundred seventy-nine thousand, nine hundred seventy-two".