51161728 has 32 divisors (see below), whose sum is σ = 102329460. Its totient is φ = 25479168.

The previous prime is 51161707. The next prime is 51161731. The reversal of 51161728 is 82716115.

It can be written as a sum of positive squares in 2 ways, for example, as 47444544 + 3717184 = 6888^2 + 1928^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51161728.

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, 39426 + ... + 40702.

Almost surely, 2^51161728 is an apocalyptic number.

It is an amenable number.

51161728 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

51161728 is a wasteful number, since it uses less digits than its factorization.

51161728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 1592 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 51161728 is about 7152.7426907446. The cubic root of 51161728 is about 371.2345612885.

The spelling of 51161728 in words is "fifty-one million, one hundred sixty-one thousand, seven hundred twenty-eight".