51397344 has 72 divisors (see below), whose sum is σ = 147125160. Its totient is φ = 17019648.

The previous prime is 51397289. The next prime is 51397363. The reversal of 51397344 is 44379315.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a junction number, because it is equal to n+sod(n) for n = 51397299 and 51397308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51054 + ... + 52050.

It is an arithmetic number, because the mean of its divisors is an integer number (2043405).

Almost surely, 2^51397344 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 51397344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73562580).

51397344 is an abundant number, since it is smaller than the sum of its proper divisors (95727816).

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

51397344 is a wasteful number, since it uses less digits than its factorization.

51397344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1181 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 51397344 is about 7169.1940969679. The cubic root of 51397344 is about 371.8035730247.

The spelling of 51397344 in words is "fifty-one million, three hundred ninety-seven thousand, three hundred forty-four".