673287640 has 32 divisors (see below), whose sum is σ = 1516086000. Its totient is φ = 269103744.

The previous prime is 673287611. The next prime is 673287647. The reversal of 673287640 is 46782376.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673287647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51271 + ... + 63049.

Almost surely, 2^673287640 is an apocalyptic number.

It is an amenable number.

673287640 is an abundant number, since it is smaller than the sum of its proper divisors (842798360).

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

673287640 is a wasteful number, since it uses less digits than its factorization.

673287640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13219 (or 13215 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 673287640 is about 25947.7868035021. The cubic root of 673287640 is about 876.4629198438.

The spelling of 673287640 in words is "six hundred seventy-three million, two hundred eighty-seven thousand, six hundred forty".