51580836 has 18 divisors (see below), whose sum is σ = 130384982. Its totient is φ = 17193600.

The previous prime is 51580831. The next prime is 51580847. The reversal of 51580836 is 63808515.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 1454436 = 7080^2 + 1206^2 .

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: 1432801 = 51580836 / (5 + 1 + 5 + 8 + 0 + 8 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 51580836.

It is not an unprimeable number, because it can be changed into a prime (51580831) 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, 716365 + ... + 716436.

Almost surely, 2^51580836 is an apocalyptic number.

It is an amenable number.

51580836 is an abundant number, since it is smaller than the sum of its proper divisors (78804146).

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

51580836 is a wasteful number, since it uses less digits than its factorization.

51580836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432811 (or 1432806 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51580836 is about 7181.9799498467. The cubic root of 51580836 is about 372.2455021833.

The spelling of 51580836 in words is "fifty-one million, five hundred eighty thousand, eight hundred thirty-six".