51206728 has 8 divisors (see below), whose sum is σ = 96012630. Its totient is φ = 25603360.

The previous prime is 51206711. The next prime is 51206777. The reversal of 51206728 is 82760215.

It can be written as a sum of positive squares in only one way, i.e., 49252324 + 1954404 = 7018^2 + 1398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 51206728.

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 as a sum of consecutive naturals, namely, 3200413 + ... + 3200428.

Almost surely, 2^51206728 is an apocalyptic number.

It is an amenable number.

51206728 is a deficient number, since it is larger than the sum of its proper divisors (44805902).

51206728 is a wasteful number, since it uses less digits than its factorization.

51206728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6400847 (or 6400843 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 51206728 is about 7155.8876458480. The cubic root of 51206728 is about 371.3433708775.

The spelling of 51206728 in words is "fifty-one million, two hundred six thousand, seven hundred twenty-eight".