672566909 has 4 divisors (see below), whose sum is σ = 768647904. Its totient is φ = 576485916.

The previous prime is 672566899. The next prime is 672566933. The reversal of 672566909 is 909665276.

672566909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 672566909 - 2²⁰ = 671518333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672566309) 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, 48040487 + ... + 48040500.

It is an arithmetic number, because the mean of its divisors is an integer number (192161976).

Almost surely, 2^672566909 is an apocalyptic number.

It is an amenable number.

672566909 is a deficient number, since it is larger than the sum of its proper divisors (96080995).

672566909 is an equidigital number, since it uses as much as digits as its factorization.

672566909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96080994.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 672566909 is about 25933.8949832068. The cubic root of 672566909 is about 876.1500671612.

The spelling of 672566909 in words is "six hundred seventy-two million, five hundred sixty-six thousand, nine hundred nine".