672718909 has 4 divisors (see below), whose sum is σ = 677629404. Its totient is φ = 667808416.

The previous prime is 672718889. The next prime is 672718913. The reversal of 672718909 is 909817276.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 523952100 + 148766809 = 22890^2 + 12197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672718909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672418909) 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, 2455042 + ... + 2455315.

It is an arithmetic number, because the mean of its divisors is an integer number (169407351).

Almost surely, 2^672718909 is an apocalyptic number.

It is an amenable number.

672718909 is a deficient number, since it is larger than the sum of its proper divisors (4910495).

672718909 is a wasteful number, since it uses less digits than its factorization.

672718909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910494.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 672718909 is about 25936.8253454427. The cubic root of 672718909 is about 876.2160654419.

The spelling of 672718909 in words is "six hundred seventy-two million, seven hundred eighteen thousand, nine hundred nine".