674618621 has 4 divisors (see below), whose sum is σ = 696380544. Its totient is φ = 652856700.

The previous prime is 674618611. The next prime is 674618627. The reversal of 674618621 is 126816476.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 674618621 - 2²² = 670424317 is a prime.

It is a super-2 number, since 2×674618621² = 910220567599883282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (674618627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10880915 + ... + 10880976.

It is an arithmetic number, because the mean of its divisors is an integer number (174095136).

Almost surely, 2^674618621 is an apocalyptic number.

It is an amenable number.

674618621 is a deficient number, since it is larger than the sum of its proper divisors (21761923).

674618621 is a wasteful number, since it uses less digits than its factorization.

674618621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21761922.

The product of its digits is 96768, while the sum is 41.

The square root of 674618621 is about 25973.4214342277. The cubic root of 674618621 is about 877.0400816045.

The spelling of 674618621 in words is "six hundred seventy-four million, six hundred eighteen thousand, six hundred twenty-one".