672595681 has 4 divisors (see below), whose sum is σ = 672653872. Its totient is φ = 672537492.

The previous prime is 672595661. The next prime is 672595733. The reversal of 672595681 is 186595276.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 672595681 - 2⁹ = 672595169 is a prime.

It is a super-2 number, since 2×672595681² = 904769900199707522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672595621) 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, 5235 + ... + 37048.

It is an arithmetic number, because the mean of its divisors is an integer number (168163468).

Almost surely, 2^672595681 is an apocalyptic number.

It is an amenable number.

672595681 is a deficient number, since it is larger than the sum of its proper divisors (58191).

672595681 is a wasteful number, since it uses less digits than its factorization.

672595681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58190.

The product of its digits is 907200, while the sum is 49.

The square root of 672595681 is about 25934.4496953377. The cubic root of 672595681 is about 876.1625607039.

The spelling of 672595681 in words is "six hundred seventy-two million, five hundred ninety-five thousand, six hundred eighty-one".