634844686 has 24 divisors (see below), whose sum is σ = 1111400136. Its totient is φ = 271177200.

The previous prime is 634844671. The next prime is 634844687. The reversal of 634844686 is 686448436.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634844687) 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, 19536 + ... + 40636.

It is an arithmetic number, because the mean of its divisors is an integer number (46308339).

Almost surely, 2^634844686 is an apocalyptic number.

634844686 is a deficient number, since it is larger than the sum of its proper divisors (476555450).

634844686 is a wasteful number, since it uses less digits than its factorization.

634844686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21424 (or 21417 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 49.

The square root of 634844686 is about 25196.1244242046. The cubic root of 634844686 is about 859.4537210373.

The spelling of 634844686 in words is "six hundred thirty-four million, eight hundred forty-four thousand, six hundred eighty-six".