672840491 has 4 divisors (see below), whose sum is σ = 673759152. Its totient is φ = 671921832.

The previous prime is 672840457. The next prime is 672840547. The reversal of 672840491 is 194048276.

672840491 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.

It is a cyclic number.

It is not a de Polignac number, because 672840491 - 2²⁶ = 605731627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672840401) 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, 458231 + ... + 459696.

It is an arithmetic number, because the mean of its divisors is an integer number (168439788).

Almost surely, 2^672840491 is an apocalyptic number.

672840491 is a deficient number, since it is larger than the sum of its proper divisors (918661).

672840491 is an equidigital number, since it uses as much as digits as its factorization.

672840491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918660.

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

The square root of 672840491 is about 25939.1690499137. The cubic root of 672840491 is about 876.2688490949.

The spelling of 672840491 in words is "six hundred seventy-two million, eight hundred forty thousand, four hundred ninety-one".