51751872 has 140 divisors (see below), whose sum is σ = 156743400. Its totient is φ = 16879104.

The previous prime is 51751867. The next prime is 51751883. The reversal of 51751872 is 27815715.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 347254 + ... + 347402.

Almost surely, 2^51751872 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 51751872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78371700).

51751872 is an abundant number, since it is smaller than the sum of its proper divisors (104991528).

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

51751872 is a wasteful number, since it uses less digits than its factorization.

51751872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 221 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 51751872 is about 7193.8773967868. The cubic root of 51751872 is about 372.6564890588.

The spelling of 51751872 in words is "fifty-one million, seven hundred fifty-one thousand, eight hundred seventy-two".