51493272 has 64 divisors (see below), whose sum is σ = 138607200. Its totient is φ = 15882240.

The previous prime is 51493271. The next prime is 51493279. The reversal of 51493272 is 27239415.

It is a super-2 number, since 2×51493272² = 5303114122531968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51493271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23854 + ... + 25922.

Almost surely, 2^51493272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51493272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69303600).

51493272 is an abundant number, since it is smaller than the sum of its proper divisors (87113928).

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

51493272 is a wasteful number, since it uses less digits than its factorization.

51493272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2152 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 51493272 is about 7175.8812699208. The cubic root of 51493272 is about 372.0347406565.

The spelling of 51493272 in words is "fifty-one million, four hundred ninety-three thousand, two hundred seventy-two".