634891902 has 8 divisors (see below), whose sum is σ = 1269783816. Its totient is φ = 211630632.

The previous prime is 634891889. The next prime is 634891909. The reversal of 634891902 is 209198436.

It is a sphenic number, since it is the product of 3 distinct primes.

634891902 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634891909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52907653 + ... + 52907664.

It is an arithmetic number, because the mean of its divisors is an integer number (158722977).

Almost surely, 2^634891902 is an apocalyptic number.

634891902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

634891902 is a wasteful number, since it uses less digits than its factorization.

634891902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105815322.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 634891902 is about 25197.0613762796. The cubic root of 634891902 is about 859.4750275405.

The spelling of 634891902 in words is "six hundred thirty-four million, eight hundred ninety-one thousand, nine hundred two".