673668621 has 12 divisors (see below), whose sum is σ = 973644672. Its totient is φ = 448850376.

The previous prime is 673668599. The next prime is 673668641. The reversal of 673668621 is 126866376.

It is not a de Polignac number, because 673668621 - 2²⁷ = 539450893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673668641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4861 + ... + 37026.

It is an arithmetic number, because the mean of its divisors is an integer number (81137056).

Almost surely, 2^673668621 is an apocalyptic number.

It is an amenable number.

673668621 is a deficient number, since it is larger than the sum of its proper divisors (299976051).

673668621 is a wasteful number, since it uses less digits than its factorization.

673668621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43680 (or 43677 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 673668621 is about 25955.1270657649. The cubic root of 673668621 is about 876.6282047024.

It can be divided in two parts, 6736 and 68621, that added together give a palindrome (75357).

The spelling of 673668621 in words is "six hundred seventy-three million, six hundred sixty-eight thousand, six hundred twenty-one".