51516320 has 48 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 19709184.

The previous prime is 51516317. The next prime is 51516331. The reversal of 51516320 is 2361515.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 2^51516320 is an apocalyptic number.

It is an amenable number.

51516320 is an abundant number, since it is smaller than the sum of its proper divisors (75491680).

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

51516320 is a wasteful number, since it uses less digits than its factorization.

51516320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14037 (or 14029 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51516320 is about 7177.4870254150. The cubic root of 51516320 is about 372.0902390247.

Adding to 51516320 its reverse (2361515), we get a palindrome (53877835).

The spelling of 51516320 in words is "fifty-one million, five hundred sixteen thousand, three hundred twenty".