673680138 has 16 divisors (see below), whose sum is σ = 1372782816. Its totient is φ = 220322960.

The previous prime is 673680083. The next prime is 673680173. The reversal of 673680138 is 831086376.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 673680138.

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, 1058928 + ... + 1059563.

It is an arithmetic number, because the mean of its divisors is an integer number (85798926).

Almost surely, 2^673680138 is an apocalyptic number.

673680138 is an abundant number, since it is smaller than the sum of its proper divisors (699102678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

673680138 is a wasteful number, since it uses less digits than its factorization.

673680138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118549.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 673680138 is about 25955.3489284964. The cubic root of 673680138 is about 876.6332002691.

The spelling of 673680138 in words is "six hundred seventy-three million, six hundred eighty thousand, one hundred thirty-eight".