672856817 has 4 divisors (see below), whose sum is σ = 675648996. Its totient is φ = 670064640.

The previous prime is 672856777. The next prime is 672856853. The reversal of 672856817 is 718658276.

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 442302961 + 230553856 = 21031^2 + 15184^2 .

It is a cyclic number.

It is not a de Polignac number, because 672856817 - 2¹⁰ = 672855793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672856867) 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, 1395728 + ... + 1396209.

It is an arithmetic number, because the mean of its divisors is an integer number (168912249).

Almost surely, 2^672856817 is an apocalyptic number.

It is an amenable number.

672856817 is a deficient number, since it is larger than the sum of its proper divisors (2792179).

672856817 is a wasteful number, since it uses less digits than its factorization.

672856817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792178.

The product of its digits is 1128960, while the sum is 50.

The square root of 672856817 is about 25939.4837458266. The cubic root of 672856817 is about 876.2759363861.

The spelling of 672856817 in words is "six hundred seventy-two million, eight hundred fifty-six thousand, eight hundred seventeen".