634758861 has 12 divisors (see below), whose sum is σ = 930280736. Its totient is φ = 384702120.

The previous prime is 634758823. The next prime is 634758893. The reversal of 634758861 is 168857436.

It is not a de Polignac number, because 634758861 - 2¹⁷ = 634627789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634758861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634758161) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 873961 + ... + 874686.

Almost surely, 2^634758861 is an apocalyptic number.

It is an amenable number.

634758861 is a deficient number, since it is larger than the sum of its proper divisors (295521875).

634758861 is a wasteful number, since it uses less digits than its factorization.

634758861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748672 (or 1748661 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 634758861 is about 25194.4212277242. The cubic root of 634758861 is about 859.4149892858.

The spelling of 634758861 in words is "six hundred thirty-four million, seven hundred fifty-eight thousand, eight hundred sixty-one".