51631872 has 144 divisors (see below), whose sum is σ = 149130240. Its totient is φ = 15814656.

The previous prime is 51631871. The next prime is 51631901. The reversal of 51631872 is 27813615.

Its product of digits (10080) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51631871) 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, 653529 + ... + 653607.

Almost surely, 2^51631872 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 51631872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74565120).

51631872 is an abundant number, since it is smaller than the sum of its proper divisors (97498368).

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

51631872 is a wasteful number, since it uses less digits than its factorization.

51631872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 144 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 51631872 is about 7185.5321306080. The cubic root of 51631872 is about 372.3682329015.

The spelling of 51631872 in words is "fifty-one million, six hundred thirty-one thousand, eight hundred seventy-two".