672872821 has 8 divisors (see below), whose sum is σ = 723358080. Its totient is φ = 623894688.

The previous prime is 672872813. The next prime is 672872831. The reversal of 672872821 is 128278276.

672872821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 672872821 - 2³ = 672872813 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 (672872831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375856 + ... + 377641.

It is an arithmetic number, because the mean of its divisors is an integer number (90419760).

Almost surely, 2^672872821 is an apocalyptic number.

It is an amenable number.

672872821 is a deficient number, since it is larger than the sum of its proper divisors (50485259).

672872821 is a wasteful number, since it uses less digits than its factorization.

672872821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753563.

The product of its digits is 150528, while the sum is 43.

The square root of 672872821 is about 25939.7922312419. The cubic root of 672872821 is about 876.2828837824.

The spelling of 672872821 in words is "six hundred seventy-two million, eight hundred seventy-two thousand, eight hundred twenty-one".