51369984 has 96 divisors (see below), whose sum is σ = 152334000. Its totient is φ = 17104896.

The previous prime is 51369979. The next prime is 51370009. The reversal of 51369984 is 48996315.

It is a happy number.

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

Its product of digits (233280) is a multiple of the sum of its prime factors (960).

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, 54832 + ... + 55760.

Almost surely, 2^51369984 is an apocalyptic number.

51369984 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51369984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76167000).

51369984 is an abundant number, since it is smaller than the sum of its proper divisors (100964016).

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

51369984 is an equidigital number, since it uses as much as digits as its factorization.

51369984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 934 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 51369984 is about 7167.2856786932. The cubic root of 51369984 is about 371.7375880889.

The spelling of 51369984 in words is "fifty-one million, three hundred sixty-nine thousand, nine hundred eighty-four".