634538256 has 80 divisors (see below), whose sum is σ = 1845977088. Its totient is φ = 186076800.

The previous prime is 634538251. The next prime is 634538273. The reversal of 634538256 is 652835436.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (634538251) 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, 3016 + ... + 35751.

Almost surely, 2^634538256 is an apocalyptic number.

634538256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634538256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922988544).

634538256 is an abundant number, since it is smaller than the sum of its proper divisors (1211438832).

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

634538256 is a wasteful number, since it uses less digits than its factorization.

634538256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38820 (or 38814 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 634538256 is about 25190.0427947235. The cubic root of 634538256 is about 859.3154169793.

The spelling of 634538256 in words is "six hundred thirty-four million, five hundred thirty-eight thousand, two hundred fifty-six".