51330624 has 56 divisors (see below), whose sum is σ = 137208768. Its totient is φ = 16934400.

The previous prime is 51330619. The next prime is 51330683. The reversal of 51330624 is 42603315.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 51330594 and 51330603.

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, 18069 + ... + 20715.

Almost surely, 2^51330624 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 51330624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68604384).

51330624 is an abundant number, since it is smaller than the sum of its proper divisors (85878144).

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

51330624 is a wasteful number, since it uses less digits than its factorization.

51330624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763 (or 2753 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 51330624 is about 7164.5393431818. The cubic root of 51330624 is about 371.6426212824.

Adding to 51330624 its reverse (42603315), we get a palindrome (93933939).

The spelling of 51330624 in words is "fifty-one million, three hundred thirty thousand, six hundred twenty-four".