51816624 has 80 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 16496640.

The previous prime is 51816623. The next prime is 51816647. The reversal of 51816624 is 42661815.

It is not an unprimeable number, because it can be changed into a prime (51816623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144157 + ... + 144515.

It is an arithmetic number, because the mean of its divisors is an integer number (1749888).

Almost surely, 2^51816624 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 51816624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69995520).

51816624 is an abundant number, since it is smaller than the sum of its proper divisors (88174416).

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

51816624 is a wasteful number, since it uses less digits than its factorization.

51816624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 492 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 51816624 is about 7198.3764836246. The cubic root of 51816624 is about 372.8118470205.

The spelling of 51816624 in words is "fifty-one million, eight hundred sixteen thousand, six hundred twenty-four".