51287312 has 20 divisors (see below), whose sum is σ = 102796620. Its totient is φ = 24759168.

The previous prime is 51287281. The next prime is 51287329. The reversal of 51287312 is 21378215.

It can be written as a sum of positive squares in 2 ways, for example, as 31181056 + 20106256 = 5584^2 + 4484^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54803 + ... + 55730.

It is an arithmetic number, because the mean of its divisors is an integer number (5139831).

Almost surely, 2^51287312 is an apocalyptic number.

It is an amenable number.

51287312 is an abundant number, since it is smaller than the sum of its proper divisors (51509308).

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

51287312 is a wasteful number, since it uses less digits than its factorization.

51287312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110570 (or 110564 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 51287312 is about 7161.5160406160. The cubic root of 51287312 is about 371.5380630711.

The spelling of 51287312 in words is "fifty-one million, two hundred eighty-seven thousand, three hundred twelve".