634404864 has 60 divisors (see below), whose sum is σ = 1691825744. Its totient is φ = 211451904.

The previous prime is 634404833. The next prime is 634404887. The reversal of 634404864 is 468404436.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42699 + ... + 55605.

Almost surely, 2^634404864 is an apocalyptic number.

634404864 is a gapful number since it is divisible by the number (64) 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 634404864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845912872).

634404864 is an abundant number, since it is smaller than the sum of its proper divisors (1057420880).

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

634404864 is an equidigital number, since it uses as much as digits as its factorization.

634404864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12938 (or 12912 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 39.

The square root of 634404864 is about 25187.3949427089. The cubic root of 634404864 is about 859.2551979491.

The spelling of 634404864 in words is "six hundred thirty-four million, four hundred four thousand, eight hundred sixty-four".