51636144 has 80 divisors (see below), whose sum is σ = 153347328. Its totient is φ = 14666496.

The previous prime is 51636121. The next prime is 51636161. The reversal of 51636144 is 44163615.

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, 75934 + ... + 76610.

Almost surely, 2^51636144 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 51636144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76673664).

51636144 is an abundant number, since it is smaller than the sum of its proper divisors (101711184).

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

51636144 is a wasteful number, since it uses less digits than its factorization.

51636144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 916 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 51636144 is about 7185.8293884561. The cubic root of 51636144 is about 372.3785024834.

Adding to 51636144 its reverse (44163615), we get a palindrome (95799759).

The spelling of 51636144 in words is "fifty-one million, six hundred thirty-six thousand, one hundred forty-four".