51636624 has 80 divisors (see below), whose sum is σ = 145532352. Its totient is φ = 15681024.

The previous prime is 51636601. The next prime is 51636647. The reversal of 51636624 is 42663615.

It is an interprime number because it is at equal distance from previous prime (51636601) and next prime (51636647).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51294 + ... + 52290.

Almost surely, 2^51636624 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 51636624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72766176).

51636624 is an abundant number, since it is smaller than the sum of its proper divisors (93895728).

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

51636624 is a wasteful number, since it uses less digits than its factorization.

51636624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1098 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 51636624 is about 7185.8627874459. The cubic root of 51636624 is about 372.3796563337.

The spelling of 51636624 in words is "fifty-one million, six hundred thirty-six thousand, six hundred twenty-four".