673561564 has 24 divisors (see below), whose sum is σ = 1270330880. Its totient is φ = 310647744.

The previous prime is 673561549. The next prime is 673561597. The reversal of 673561564 is 465165376.

It is a self number, because there is not a number n which added to its sum of digits gives 673561564.

It is a congruent number.

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, 82582 + ... + 90370.

Almost surely, 2^673561564 is an apocalyptic number.

It is an amenable number.

673561564 is a deficient number, since it is larger than the sum of its proper divisors (596769316).

673561564 is a wasteful number, since it uses less digits than its factorization.

673561564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469 (or 9467 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The square root of 673561564 is about 25953.0646359924. The cubic root of 673561564 is about 876.5817653727.

The spelling of 673561564 in words is "six hundred seventy-three million, five hundred sixty-one thousand, five hundred sixty-four".