671921692 has 48 divisors (see below), whose sum is σ = 1284552640. Its totient is φ = 307509696.

The previous prime is 671921647. The next prime is 671921699. The reversal of 671921692 is 296129176.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671921699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1379473 + ... + 1379959.

Almost surely, 2^671921692 is an apocalyptic number.

It is an amenable number.

671921692 is a deficient number, since it is larger than the sum of its proper divisors (612630948).

671921692 is a wasteful number, since it uses less digits than its factorization.

671921692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 659 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 671921692 is about 25921.4523512862. The cubic root of 671921692 is about 875.8698037011.

The spelling of 671921692 in words is "six hundred seventy-one million, nine hundred twenty-one thousand, six hundred ninety-two".