631644679 has 8 divisors (see below), whose sum is σ = 654750000. Its totient is φ = 608627712.

The previous prime is 631644677. The next prime is 631644701. The reversal of 631644679 is 976446136.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 631644679 - 2¹ = 631644677 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 (631644677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7354 + ... + 36295.

It is an arithmetic number, because the mean of its divisors is an integer number (81843750).

Almost surely, 2^631644679 is an apocalyptic number.

631644679 is a deficient number, since it is larger than the sum of its proper divisors (23105321).

631644679 is a wasteful number, since it uses less digits than its factorization.

631644679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44177.

The product of its digits is 653184, while the sum is 46.

The square root of 631644679 is about 25132.5422311393. The cubic root of 631644679 is about 858.0072297592.

The spelling of 631644679 in words is "six hundred thirty-one million, six hundred forty-four thousand, six hundred seventy-nine".