634830978 has 64 divisors (see below), whose sum is σ = 1334817792. Its totient is φ = 201090240.

The previous prime is 634830971. The next prime is 634830991. The reversal of 634830978 is 879038436.

It is not an unprimeable number, because it can be changed into a prime (634830971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2413675 + ... + 2413937.

It is an arithmetic number, because the mean of its divisors is an integer number (20856528).

Almost surely, 2^634830978 is an apocalyptic number.

634830978 is an abundant number, since it is smaller than the sum of its proper divisors (699986814).

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

634830978 is a wasteful number, since it uses less digits than its factorization.

634830978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519.

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 634830978 is about 25195.8523967736. The cubic root of 634830978 is about 859.4475350222.

The spelling of 634830978 in words is "six hundred thirty-four million, eight hundred thirty thousand, nine hundred seventy-eight".