51998880 has 96 divisors (see below), whose sum is σ = 165279744. Its totient is φ = 13741056.

The previous prime is 51998809. The next prime is 51998939. The reversal of 51998880 is 8889915.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60534 + ... + 61386.

It is an arithmetic number, because the mean of its divisors is an integer number (1721664).

Almost surely, 2^51998880 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 51998880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82639872).

51998880 is an abundant number, since it is smaller than the sum of its proper divisors (113280864).

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

51998880 is a wasteful number, since it uses less digits than its factorization.

51998880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 51998880 is about 7211.0248924823. The cubic root of 51998880 is about 373.2484359109.

It can be divided in two parts, 519 and 98880, that added together give a palindrome (99399).

The spelling of 51998880 in words is "fifty-one million, nine hundred ninety-eight thousand, eight hundred eighty".