673511638 has 4 divisors (see below), whose sum is σ = 1010267460. Its totient is φ = 336755818.

The previous prime is 673511617. The next prime is 673511653. The reversal of 673511638 is 836115376.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 673511638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 168377908 + ... + 168377911.

It is an arithmetic number, because the mean of its divisors is an integer number (252566865).

Almost surely, 2^673511638 is an apocalyptic number.

673511638 is a deficient number, since it is larger than the sum of its proper divisors (336755822).

673511638 is a wasteful number, since it uses less digits than its factorization.

673511638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336755821.

The product of its digits is 90720, while the sum is 40.

The square root of 673511638 is about 25952.1027664426. The cubic root of 673511638 is about 876.5601067227.

The spelling of 673511638 in words is "six hundred seventy-three million, five hundred eleven thousand, six hundred thirty-eight".