672731 has 4 divisors (see below), whose sum is σ = 694464. Its totient is φ = 651000.

The previous prime is 672703. The next prime is 672743. The reversal of 672731 is 137276.

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

It is not a de Polignac number, because 672731 - 2⁶ = 672667 is a prime.

It is a super-2 number, since 2×672731² = 905133996722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 672731.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672731.

It is not an unprimeable number, because it can be changed into a prime (672781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10820 + ... + 10881.

It is an arithmetic number, because the mean of its divisors is an integer number (173616).

2⁶⁷²⁷³¹ is an apocalyptic number.

672731 is a deficient number, since it is larger than the sum of its proper divisors (21733).

672731 is a wasteful number, since it uses less digits than its factorization.

672731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21732.

The product of its digits is 1764, while the sum is 26.

The square root of 672731 is about 820.2018044360. The cubic root of 672731 is about 87.6221314918.

The spelling of 672731 in words is "six hundred seventy-two thousand, seven hundred thirty-one".