51520968 has 64 divisors (see below), whose sum is σ = 144648000. Its totient is φ = 16989696.

The previous prime is 51520961. The next prime is 51520981. The reversal of 51520968 is 86902515.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (51520961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19723 + ... + 22181.

It is an arithmetic number, because the mean of its divisors is an integer number (2260125).

Almost surely, 2^51520968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72324000).

51520968 is an abundant number, since it is smaller than the sum of its proper divisors (93127032).

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

51520968 is a wasteful number, since it uses less digits than its factorization.

51520968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 51520968 is about 7177.8108083175. The cubic root of 51520968 is about 372.1014291577.

The spelling of 51520968 in words is "fifty-one million, five hundred twenty thousand, nine hundred sixty-eight".