672659891 has 4 divisors (see below), whose sum is σ = 672728232. Its totient is φ = 672591552.

The previous prime is 672659873. The next prime is 672659947. The reversal of 672659891 is 198956276.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 672659891 - 2¹⁰ = 672658867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672659861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16286 + ... + 40131.

It is an arithmetic number, because the mean of its divisors is an integer number (168182058).

Almost surely, 2^672659891 is an apocalyptic number.

672659891 is a deficient number, since it is larger than the sum of its proper divisors (68341).

672659891 is a wasteful number, since it uses less digits than its factorization.

672659891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68340.

The product of its digits is 1632960, while the sum is 53.

The square root of 672659891 is about 25935.6875945096. The cubic root of 672659891 is about 876.1904410534.

The spelling of 672659891 in words is "six hundred seventy-two million, six hundred fifty-nine thousand, eight hundred ninety-one".