51328737 has 12 divisors (see below), whose sum is σ = 74226724. Its totient is φ = 34179840.

The previous prime is 51328721. The next prime is 51328759. The reversal of 51328737 is 73782315.

It can be written as a sum of positive squares in 2 ways, for example, as 34999056 + 16329681 = 5916^2 + 4041^2 .

It is not a de Polignac number, because 51328737 - 2⁴ = 51328721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51378737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6537 + ... + 12057.

Almost surely, 2^51328737 is an apocalyptic number.

It is an amenable number.

51328737 is a deficient number, since it is larger than the sum of its proper divisors (22897987).

51328737 is a wasteful number, since it uses less digits than its factorization.

51328737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560 (or 6557 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 51328737 is about 7164.4076517183. The cubic root of 51328737 is about 371.6380671575.

The spelling of 51328737 in words is "fifty-one million, three hundred twenty-eight thousand, seven hundred thirty-seven".