631752128 has 56 divisors (see below), whose sum is σ = 1508150400. Its totient is φ = 256497408.

The previous prime is 631752127. The next prime is 631752157. The reversal of 631752128 is 821257136.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×631752128² = 798221502465056768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631752127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28598 + ... + 45621.

Almost surely, 2^631752128 is an apocalyptic number.

It is an amenable number.

631752128 is an abundant number, since it is smaller than the sum of its proper divisors (876398272).

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

631752128 is a wasteful number, since it uses less digits than its factorization.

631752128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74257 (or 74247 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 631752128 is about 25134.6797870989. The cubic root of 631752128 is about 858.0558788362.

The spelling of 631752128 in words is "six hundred thirty-one million, seven hundred fifty-two thousand, one hundred twenty-eight".