634876779 has 4 divisors (see below), whose sum is σ = 846502376. Its totient is φ = 423251184.

The previous prime is 634876777. The next prime is 634876789. The reversal of 634876779 is 977678436.

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

It is not a de Polignac number, because 634876779 - 2¹ = 634876777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634876777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105812794 + ... + 105812799.

It is an arithmetic number, because the mean of its divisors is an integer number (211625594).

Almost surely, 2^634876779 is an apocalyptic number.

634876779 is a deficient number, since it is larger than the sum of its proper divisors (211625597).

634876779 is a wasteful number, since it uses less digits than its factorization.

634876779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211625596.

The product of its digits is 10668672, while the sum is 57.

The square root of 634876779 is about 25196.7612799741. The cubic root of 634876779 is about 859.4682033110.

The spelling of 634876779 in words is "six hundred thirty-four million, eight hundred seventy-six thousand, seven hundred seventy-nine".