634984579 has 4 divisors (see below), whose sum is σ = 668404840. Its totient is φ = 601564320.

The previous prime is 634984513. The next prime is 634984583. The reversal of 634984579 is 975489436.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 634984579 - 2¹¹ = 634982531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634984079) by changing a digit.

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, 16710102 + ... + 16710139.

It is an arithmetic number, because the mean of its divisors is an integer number (167101210).

Almost surely, 2^634984579 is an apocalyptic number.

634984579 is a deficient number, since it is larger than the sum of its proper divisors (33420261).

634984579 is a wasteful number, since it uses less digits than its factorization.

634984579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33420260.

The product of its digits is 6531840, while the sum is 55.

The square root of 634984579 is about 25198.9003529916. The cubic root of 634984579 is about 859.5168455210.

The spelling of 634984579 in words is "six hundred thirty-four million, nine hundred eighty-four thousand, five hundred seventy-nine".