51813312 has 56 divisors (see below), whose sum is σ = 137629392. Its totient is φ = 17203200.

The previous prime is 51813301. The next prime is 51813337. The reversal of 51813312 is 21331815.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 80512 + ... + 81152.

Almost surely, 2^51813312 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 51813312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68814696).

51813312 is an abundant number, since it is smaller than the sum of its proper divisors (85816080).

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

51813312 is a wasteful number, since it uses less digits than its factorization.

51813312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1067 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 51813312 is about 7198.1464280744. The cubic root of 51813312 is about 372.8039037579.

It can be divided in two parts, 51813 and 312, that added together give a palindrome (52125).

The spelling of 51813312 in words is "fifty-one million, eight hundred thirteen thousand, three hundred twelve".