51538536 has 48 divisors (see below), whose sum is σ = 159525600. Its totient is φ = 14725152.

The previous prime is 51538519. The next prime is 51538541. The reversal of 51538536 is 63583515.

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 51538536.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50626 + ... + 51633.

It is an arithmetic number, because the mean of its divisors is an integer number (3323450).

Almost surely, 2^51538536 is an apocalyptic number.

51538536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51538536 is an abundant number, since it is smaller than the sum of its proper divisors (107987064).

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

51538536 is a wasteful number, since it uses less digits than its factorization.

51538536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102278 (or 102271 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 51538536 is about 7179.0344754709. The cubic root of 51538536 is about 372.1437183155.

It can be divided in two parts, 5153 and 8536, that added together give a square (13689 = 117²).

The spelling of 51538536 in words is "fifty-one million, five hundred thirty-eight thousand, five hundred thirty-six".