51558372 has 18 divisors (see below), whose sum is σ = 130328198. Its totient is φ = 17186112.

The previous prime is 51558337. The next prime is 51558373. The reversal of 51558372 is 27385515.

51558372 is a `hidden beast` number, since 5 + 1 + 5 + 583 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39614436 + 11943936 = 6294^2 + 3456^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1432177 = 51558372 / (5 + 1 + 5 + 5 + 8 + 3 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (51558373) 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, 716053 + ... + 716124.

Almost surely, 2^51558372 is an apocalyptic number.

It is an amenable number.

51558372 is an abundant number, since it is smaller than the sum of its proper divisors (78769826).

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

51558372 is a wasteful number, since it uses less digits than its factorization.

51558372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432187 (or 1432182 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 51558372 is about 7180.4158653939. The cubic root of 51558372 is about 372.1914553846.

The spelling of 51558372 in words is "fifty-one million, five hundred fifty-eight thousand, three hundred seventy-two".