673945990 has 16 divisors (see below), whose sum is σ = 1214203248. Its totient is φ = 269333856.

The previous prime is 673945963. The next prime is 673945991. The reversal of 673945990 is 99549376.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673945991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18777 + ... + 41236.

It is an arithmetic number, because the mean of its divisors is an integer number (75887703).

Almost surely, 2^673945990 is an apocalyptic number.

673945990 is a deficient number, since it is larger than the sum of its proper divisors (540257258).

673945990 is a wasteful number, since it uses less digits than its factorization.

673945990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61143.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The square root of 673945990 is about 25960.4697569208. The cubic root of 673945990 is about 876.7484993191.

The spelling of 673945990 in words is "six hundred seventy-three million, nine hundred forty-five thousand, nine hundred ninety".