51998112 has 96 divisors (see below), whose sum is σ = 153740160. Its totient is φ = 17309376.

The previous prime is 51998099. The next prime is 51998113. The reversal of 51998112 is 21189915.

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 (36).

It is not an unprimeable number, because it can be changed into a prime (51998113) 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, 69613 + ... + 70355.

It is an arithmetic number, because the mean of its divisors is an integer number (1601460).

Almost surely, 2^51998112 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 51998112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76870080).

51998112 is an abundant number, since it is smaller than the sum of its proper divisors (101742048).

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

51998112 is an frugal number, since it uses more digits than its factorization.

51998112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 748 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 51998112 is about 7210.9716404934. The cubic root of 51998112 is about 373.2465983315.

The spelling of 51998112 in words is "fifty-one million, nine hundred ninety-eight thousand, one hundred twelve".