671609990 has 24 divisors (see below), whose sum is σ = 1284198192. Its totient is φ = 252840320.

The previous prime is 671609989. The next prime is 671610013. The reversal of 671609990 is 99906176.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113306 + ... + 119085.

It is an arithmetic number, because the mean of its divisors is an integer number (53508258).

Almost surely, 2^671609990 is an apocalyptic number.

671609990 is a deficient number, since it is larger than the sum of its proper divisors (612588202).

671609990 is a wasteful number, since it uses less digits than its factorization.

671609990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232432 (or 232415 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 671609990 is about 25915.4392206654. The cubic root of 671609990 is about 875.7343451599.

The spelling of 671609990 in words is "six hundred seventy-one million, six hundred nine thousand, nine hundred ninety".