634864 has 10 divisors (see below), whose sum is σ = 1230080. Its totient is φ = 317424.

The previous prime is 634861. The next prime is 634871. The reversal of 634864 is 468436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19824 + ... + 19855.

It is an arithmetic number, because the mean of its divisors is an integer number (123008).

2⁶³⁴⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

634864 is a deficient number, since it is larger than the sum of its proper divisors (595216).

634864 is a wasteful number, since it uses less digits than its factorization.

634864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39687 (or 39681 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 634864 is about 796.7835339664. The cubic root of 634864 is about 85.9462436723.

The spelling of 634864 in words is "six hundred thirty-four thousand, eight hundred sixty-four".