672012891 has 48 divisors (see below), whose sum is σ = 1088305920. Its totient is φ = 396135360.

The previous prime is 672012889. The next prime is 672012931. The reversal of 672012891 is 198210276.

It is not a de Polignac number, because 672012891 - 2¹ = 672012889 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (672012821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 601065 + ... + 602181.

It is an arithmetic number, because the mean of its divisors is an integer number (22673040).

Almost surely, 2^672012891 is an apocalyptic number.

672012891 is a deficient number, since it is larger than the sum of its proper divisors (416293029).

672012891 is a wasteful number, since it uses less digits than its factorization.

672012891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1293 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 672012891 is about 25923.2114329996. The cubic root of 672012891 is about 875.9094287732.

The spelling of 672012891 in words is "six hundred seventy-two million, twelve thousand, eight hundred ninety-one".