51308972 has 48 divisors (see below), whose sum is σ = 106197504. Its totient is φ = 21384000.

The previous prime is 51308963. The next prime is 51308989. The reversal of 51308972 is 27980315.

It is a super-2 number, since 2×51308972² = 5265221215393568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154847 + ... + 155177.

It is an arithmetic number, because the mean of its divisors is an integer number (2212448).

Almost surely, 2^51308972 is an apocalyptic number.

51308972 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51308972 is an abundant number, since it is smaller than the sum of its proper divisors (54888532).

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

51308972 is a wasteful number, since it uses less digits than its factorization.

51308972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 51308972 is about 7163.0281306163. The cubic root of 51308972 is about 371.5903591882.

The spelling of 51308972 in words is "fifty-one million, three hundred eight thousand, nine hundred seventy-two".