634656646 has 16 divisors (see below), whose sum is σ = 1039657248. Its totient is φ = 288792000.

The previous prime is 634656599. The next prime is 634656647. The reversal of 634656646 is 646656436.

It is a junction number, because it is equal to n+sod(n) for n = 634656596 and 634656605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634656647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170055 + ... + 173746.

It is an arithmetic number, because the mean of its divisors is an integer number (64978578).

Almost surely, 2^634656646 is an apocalyptic number.

634656646 is a deficient number, since it is larger than the sum of its proper divisors (405000602).

634656646 is a wasteful number, since it uses less digits than its factorization.

634656646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343887.

The product of its digits is 1866240, while the sum is 46.

The square root of 634656646 is about 25192.3926215832. The cubic root of 634656646 is about 859.3688563766.

The spelling of 634656646 in words is "six hundred thirty-four million, six hundred fifty-six thousand, six hundred forty-six".