634780 has 24 divisors (see below), whose sum is σ = 1412208. Its totient is φ = 238848.

The previous prime is 634759. The next prime is 634793. The reversal of 634780 is 87436.

634780 is nontrivially palindromic in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (58842).

2⁶³⁴⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

634780 is an abundant number, since it is smaller than the sum of its proper divisors (777428).

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

634780 is a wasteful number, since it uses less digits than its factorization.

634780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 634780 is about 796.7308202900. The cubic root of 634780 is about 85.9424529377.

The spelling of 634780 in words is "six hundred thirty-four thousand, seven hundred eighty".