634221664 has 24 divisors (see below), whose sum is σ = 1265733000. Its totient is φ = 312765696.

The previous prime is 634221649. The next prime is 634221673. The reversal of 634221664 is 466122436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133414 + ... + 138085.

It is an arithmetic number, because the mean of its divisors is an integer number (52738875).

Almost surely, 2^634221664 is an apocalyptic number.

It is an amenable number.

634221664 is a deficient number, since it is larger than the sum of its proper divisors (631511336).

634221664 is a wasteful number, since it uses less digits than its factorization.

634221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271582 (or 271574 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 634221664 is about 25183.7579403869. The cubic root of 634221664 is about 859.1724796325.

The spelling of 634221664 in words is "six hundred thirty-four million, two hundred twenty-one thousand, six hundred sixty-four".