669431636 has 24 divisors (see below), whose sum is σ = 1245387360. Its totient is φ = 313956000.

The previous prime is 669431599. The next prime is 669431677. The reversal of 669431636 is 636134966.

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, 35930 + ... + 51281.

It is an arithmetic number, because the mean of its divisors is an integer number (51891140).

Almost surely, 2^669431636 is an apocalyptic number.

It is an amenable number.

669431636 is a deficient number, since it is larger than the sum of its proper divisors (575955724).

669431636 is a wasteful number, since it uses less digits than its factorization.

669431636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87335 (or 87333 counting only the distinct ones).

The product of its digits is 419904, while the sum is 44.

The square root of 669431636 is about 25873.3769732519. The cubic root of 669431636 is about 874.7865105276.

The spelling of 669431636 in words is "six hundred sixty-nine million, four hundred thirty-one thousand, six hundred thirty-six".