51539436 has 48 divisors (see below), whose sum is σ = 143903200. Its totient is φ = 15857856.

The previous prime is 51539417. The next prime is 51539437. The reversal of 51539436 is 63493515.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51539436.

It is not an unprimeable number, because it can be changed into a prime (51539437) 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, 16951 + ... + 19758.

Almost surely, 2^51539436 is an apocalyptic number.

It is an amenable number.

51539436 is an abundant number, since it is smaller than the sum of its proper divisors (92363764).

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

51539436 is a wasteful number, since it uses less digits than its factorization.

51539436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36735 (or 36727 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 51539436 is about 7179.0971577212. The cubic root of 51539436 is about 372.1458845094.

The spelling of 51539436 in words is "fifty-one million, five hundred thirty-nine thousand, four hundred thirty-six".