673639109 has 32 divisors (see below), whose sum is σ = 819915264. Its totient is φ = 545287680.

The previous prime is 673639051. The next prime is 673639117. The reversal of 673639109 is 901936376.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 673639109 - 2²⁴ = 656861893 is a prime.

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 673639109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673639139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489947 + ... + 491319.

It is an arithmetic number, because the mean of its divisors is an integer number (25622352).

Almost surely, 2^673639109 is an apocalyptic number.

It is an amenable number.

673639109 is a deficient number, since it is larger than the sum of its proper divisors (146276155).

673639109 is a wasteful number, since it uses less digits than its factorization.

673639109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 673639109 is about 25954.5585398789. The cubic root of 673639109 is about 876.6154034385.

The spelling of 673639109 in words is "six hundred seventy-three million, six hundred thirty-nine thousand, one hundred nine".