634995980 has 12 divisors (see below), whose sum is σ = 1333491600. Its totient is φ = 253998384.

The previous prime is 634995947. The next prime is 634996009. The reversal of 634995980 is 89599436.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15874880 + ... + 15874919.

It is an arithmetic number, because the mean of its divisors is an integer number (111124300).

Almost surely, 2^634995980 is an apocalyptic number.

It is an amenable number.

634995980 is an abundant number, since it is smaller than the sum of its proper divisors (698495620).

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

634995980 is a wasteful number, since it uses less digits than its factorization.

634995980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31749808 (or 31749806 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 634995980 is about 25199.1265721652. The cubic root of 634995980 is about 859.5219896318.

The spelling of 634995980 in words is "six hundred thirty-four million, nine hundred ninety-five thousand, nine hundred eighty".