634492515128 has 24 divisors (see below), whose sum is σ = 1228074308640. Its totient is φ = 307006437600.

The previous prime is 634492515127. The next prime is 634492515169. The reversal of 634492515128 is 821515294436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634492515127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12518798 + ... + 12569378.

It is an arithmetic number, because the mean of its divisors is an integer number (51169762860).

Almost surely, 2^634492515128 is an apocalyptic number.

It is an amenable number.

634492515128 is a deficient number, since it is larger than the sum of its proper divisors (593581793512).

634492515128 is an frugal number, since it uses more digits than its factorization.

634492515128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101199 (or 50614 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The spelling of 634492515128 in words is "six hundred thirty-four billion, four hundred ninety-two million, five hundred fifteen thousand, one hundred twenty-eight".