51715728 has 30 divisors (see below), whose sum is σ = 144732614. Its totient is φ = 17238528.

The previous prime is 51715709. The next prime is 51715747. The reversal of 51715728 is 82751715.

It is an interprime number because it is at equal distance from previous prime (51715709) and next prime (51715747).

It can be written as a sum of positive squares in only one way, i.e., 44997264 + 6718464 = 6708^2 + 2592^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51715692 and 51715701.

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 in 5 ways as a sum of consecutive naturals, for example, 179425 + ... + 179712.

Almost surely, 2^51715728 is an apocalyptic number.

It is an amenable number.

51715728 is an abundant number, since it is smaller than the sum of its proper divisors (93016886).

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

51715728 is a wasteful number, since it uses less digits than its factorization.

51715728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359151 (or 359142 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 51715728 is about 7191.3648217845. The cubic root of 51715728 is about 372.5697132410.

The spelling of 51715728 in words is "fifty-one million, seven hundred fifteen thousand, seven hundred twenty-eight".