634720 has 24 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 253824.

The previous prime is 634717. The next prime is 634727. The reversal of 634720 is 27436.

634720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 634691 and 634700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2⁶³⁴⁷²⁰ is an apocalyptic number.

It is an amenable number.

634720 is an abundant number, since it is smaller than the sum of its proper divisors (865184).

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

634720 is a wasteful number, since it uses less digits than its factorization.

634720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982 (or 3974 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 634720 is about 796.6931655286. The cubic root of 634720 is about 85.9397450653.

The spelling of 634720 in words is "six hundred thirty-four thousand, seven hundred twenty".