51587136 has 42 divisors (see below), whose sum is σ = 147866862. Its totient is φ = 17195520.

The previous prime is 51587117. The next prime is 51587141. The reversal of 51587136 is 63178515.

51587136 is a `hidden beast` number, since 515 + 8 + 7 + 136 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37748736 + 13838400 = 6144^2 + 3720^2 .

It is a super-2 number, since 2×51587136² = 5322465201364992, which contains 22 as substring.

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 51587136.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44205 + ... + 45356.

Almost surely, 2^51587136 is an apocalyptic number.

It is an amenable number.

51587136 is an abundant number, since it is smaller than the sum of its proper divisors (96279726).

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

51587136 is a wasteful number, since it uses less digits than its factorization.

51587136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89579 (or 89566 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51587136 is about 7182.4185341708. The cubic root of 51587136 is about 372.2606567212.

The spelling of 51587136 in words is "fifty-one million, five hundred eighty-seven thousand, one hundred thirty-six".