51630128 has 40 divisors (see below), whose sum is σ = 112659456. Its totient is φ = 22708800.

The previous prime is 51630091. The next prime is 51630149. The reversal of 51630128 is 82103615.

It is a junction number, because it is equal to n+sod(n) for n = 51630097 and 51630106.

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, 725 + ... + 10187.

Almost surely, 2^51630128 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 51630128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56329728).

51630128 is an abundant number, since it is smaller than the sum of its proper divisors (61029328).

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

51630128 is a wasteful number, since it uses less digits than its factorization.

51630128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9513 (or 9507 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51630128 is about 7185.4107746182. The cubic root of 51630128 is about 372.3640402876.

The spelling of 51630128 in words is "fifty-one million, six hundred thirty thousand, one hundred twenty-eight".