634564 has 24 divisors (see below), whose sum is σ = 1286208. Its totient is φ = 268320.

The previous prime is 634541. The next prime is 634567. The reversal of 634564 is 465436.

634564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (634567) by changing a digit.

634564 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3582 + ... + 3754.

It is an arithmetic number, because the mean of its divisors is an integer number (53592).

2⁶³⁴⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

634564 is an abundant number, since it is smaller than the sum of its proper divisors (651644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634564 is a wasteful number, since it uses less digits than its factorization.

634564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 313 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 634564 is about 796.5952548189. The cubic root of 634564 is about 85.9327037984.

Adding to 634564 its product of digits (8640), we get a square (643204 = 802²).

The spelling of 634564 in words is "six hundred thirty-four thousand, five hundred sixty-four".