51752720 has 20 divisors (see below), whose sum is σ = 120325260. Its totient is φ = 20701056.

The previous prime is 51752719. The next prime is 51752747. The reversal of 51752720 is 2725715.

It can be written as a sum of positive squares in 2 ways, for example, as 34480384 + 17272336 = 5872^2 + 4156^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 323375 + ... + 323534.

It is an arithmetic number, because the mean of its divisors is an integer number (6016263).

Almost surely, 2^51752720 is an apocalyptic number.

It is an amenable number.

51752720 is an abundant number, since it is smaller than the sum of its proper divisors (68572540).

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

51752720 is a wasteful number, since it uses less digits than its factorization.

51752720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646922 (or 646916 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 51752720 is about 7193.9363355537. The cubic root of 51752720 is about 372.6585244826.

The spelling of 51752720 in words is "fifty-one million, seven hundred fifty-two thousand, seven hundred twenty".