51371720 has 16 divisors (see below), whose sum is σ = 115586460. Its totient is φ = 20548672.

The previous prime is 51371693. The next prime is 51371741. The reversal of 51371720 is 2717315.

It can be written as a sum of positive squares in 2 ways, for example, as 51351556 + 20164 = 7166^2 + 142^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51371720.

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, 642107 + ... + 642186.

Almost surely, 2^51371720 is an apocalyptic number.

It is an amenable number.

51371720 is an abundant number, since it is smaller than the sum of its proper divisors (64214740).

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

51371720 is a wasteful number, since it uses less digits than its factorization.

51371720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284304 (or 1284300 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 51371720 is about 7167.4067834887. The cubic root of 51371720 is about 371.7417755484.

The spelling of 51371720 in words is "fifty-one million, three hundred seventy-one thousand, seven hundred twenty".