634820 has 12 divisors (see below), whose sum is σ = 1333164. Its totient is φ = 253920.

The previous prime is 634817. The next prime is 634841. The reversal of 634820 is 28436.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 341056 + 293764 = 584^2 + 542^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 634820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15851 + ... + 15890.

It is an arithmetic number, because the mean of its divisors is an integer number (111097).

2⁶³⁴⁸²⁰ is an apocalyptic number.

It is an amenable number.

634820 is an abundant number, since it is smaller than the sum of its proper divisors (698344).

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

634820 is a wasteful number, since it uses less digits than its factorization.

634820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31750 (or 31748 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 634820 is about 796.7559224756. The cubic root of 634820 is about 85.9442580911.

The spelling of 634820 in words is "six hundred thirty-four thousand, eight hundred twenty".