51231888 has 30 divisors (see below), whose sum is σ = 143378534. Its totient is φ = 17077248.

The previous prime is 51231841. The next prime is 51231889. The reversal of 51231888 is 88813215.

It can be written as a sum of positive squares in only one way, i.e., 36578304 + 14653584 = 6048^2 + 3828^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51231889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177745 + ... + 178032.

Almost surely, 2^51231888 is an apocalyptic number.

It is an amenable number.

51231888 is an abundant number, since it is smaller than the sum of its proper divisors (92146646).

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

51231888 is a wasteful number, since it uses less digits than its factorization.

51231888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355791 (or 355782 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 51231888 is about 7157.6454229027. The cubic root of 51231888 is about 371.4041797451.

It can be divided in two parts, 512 and 31888, that added together give a square (32400 = 180²).

The spelling of 51231888 in words is "fifty-one million, two hundred thirty-one thousand, eight hundred eighty-eight".