634390168 has 8 divisors (see below), whose sum is σ = 1189481580. Its totient is φ = 317195080.

The previous prime is 634390121. The next prime is 634390187. The reversal of 634390168 is 861093436.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 634390168.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 39649378 + ... + 39649393.

Almost surely, 2^634390168 is an apocalyptic number.

It is an amenable number.

634390168 is a deficient number, since it is larger than the sum of its proper divisors (555091412).

634390168 is a wasteful number, since it uses less digits than its factorization.

634390168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79298777 (or 79298773 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 634390168 is about 25187.1032077927. The cubic root of 634390168 is about 859.2485630106.

The spelling of 634390168 in words is "six hundred thirty-four million, three hundred ninety thousand, one hundred sixty-eight".