672709 has 4 divisors (see below), whose sum is σ = 679104. Its totient is φ = 666316.

The previous prime is 672703. The next prime is 672743. The reversal of 672709 is 907276.

It is a happy number.

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 672709 - 2¹⁵ = 639941 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672703) 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, 3037 + ... + 3250.

It is an arithmetic number, because the mean of its divisors is an integer number (169776).

2⁶⁷²⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

672709 is a deficient number, since it is larger than the sum of its proper divisors (6395).

672709 is a wasteful number, since it uses less digits than its factorization.

672709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6394.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 672709 is about 820.1883929927. The cubic root of 672709 is about 87.6211763265.

It can be divided in two parts, 67 and 2709, that multiplied together give a triangular number (181503 = T₆₀₂).

The spelling of 672709 in words is "six hundred seventy-two thousand, seven hundred nine".