683634639 has 4 divisors (see below), whose sum is σ = 911512856. Its totient is φ = 455756424.

The previous prime is 683634613. The next prime is 683634643. The reversal of 683634639 is 936436386.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 683634639 - 2¹⁷ = 683503567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683634659) 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, 113939104 + ... + 113939109.

It is an arithmetic number, because the mean of its divisors is an integer number (227878214).

Almost surely, 2^683634639 is an apocalyptic number.

683634639 is a deficient number, since it is larger than the sum of its proper divisors (227878217).

683634639 is a wasteful number, since it uses less digits than its factorization.

683634639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227878216.

The product of its digits is 1679616, while the sum is 48.

The square root of 683634639 is about 26146.4077647389. The cubic root of 683634639 is about 880.9299050130.

The spelling of 683634639 in words is "six hundred eighty-three million, six hundred thirty-four thousand, six hundred thirty-nine".