634873978 has 16 divisors (see below), whose sum is σ = 961191360. Its totient is φ = 314490400.

The previous prime is 634873933. The next prime is 634874011. The reversal of 634873978 is 879378436.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97443 + ... + 103753.

It is an arithmetic number, because the mean of its divisors is an integer number (60074460).

Almost surely, 2^634873978 is an apocalyptic number.

634873978 is a deficient number, since it is larger than the sum of its proper divisors (326317382).

634873978 is a wasteful number, since it uses less digits than its factorization.

634873978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773.

The product of its digits is 6096384, while the sum is 55.

The square root of 634873978 is about 25196.7056973724. The cubic root of 634873978 is about 859.4669393524.

The spelling of 634873978 in words is "six hundred thirty-four million, eight hundred seventy-three thousand, nine hundred seventy-eight".