51897968 has 40 divisors (see below), whose sum is σ = 109278720. Its totient is φ = 23785920.

The previous prime is 51897961. The next prime is 51897977. The reversal of 51897968 is 86979815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6671 + ... + 12177.

It is an arithmetic number, because the mean of its divisors is an integer number (2731968).

Almost surely, 2^51897968 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 51897968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54639360).

51897968 is an abundant number, since it is smaller than the sum of its proper divisors (57380752).

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

51897968 is a wasteful number, since it uses less digits than its factorization.

51897968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5565 (or 5559 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 53.

The square root of 51897968 is about 7204.0244308303. The cubic root of 51897968 is about 373.0068304662.

The spelling of 51897968 in words is "fifty-one million, eight hundred ninety-seven thousand, nine hundred sixty-eight".