669784631 has 8 divisors (see below), whose sum is σ = 678609264. Its totient is φ = 661003200.

The previous prime is 669784573. The next prime is 669784669. The reversal of 669784631 is 136487966.

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 669784631 - 2⁶ = 669784567 is a prime.

It is a super-2 number, since 2×669784631² = 897222903847612322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669784631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669784681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21020 + ... + 42206.

It is an arithmetic number, because the mean of its divisors is an integer number (84826158).

Almost surely, 2^669784631 is an apocalyptic number.

669784631 is a deficient number, since it is larger than the sum of its proper divisors (8824633).

669784631 is a wasteful number, since it uses less digits than its factorization.

669784631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21601.

The product of its digits is 1306368, while the sum is 50.

The square root of 669784631 is about 25880.1976615326. The cubic root of 669784631 is about 874.9402434293.

The spelling of 669784631 in words is "six hundred sixty-nine million, seven hundred eighty-four thousand, six hundred thirty-one".