8672991 has 4 divisors (see below), whose sum is σ = 11563992. Its totient is φ = 5781992.

The previous prime is 8672969. The next prime is 8673011. The reversal of 8672991 is 1992768.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8672991 - 2⁶ = 8672927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8672791) 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 3 ways as a sum of consecutive naturals, for example, 1445496 + ... + 1445501.

It is an arithmetic number, because the mean of its divisors is an integer number (2890998).

Almost surely, 2^8672991 is an apocalyptic number.

8672991 is a deficient number, since it is larger than the sum of its proper divisors (2891001).

8672991 is a wasteful number, since it uses less digits than its factorization.

8672991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891000.

The product of its digits is 54432, while the sum is 42.

The square root of 8672991 is about 2944.9942274986. The cubic root of 8672991 is about 205.4579569569.

The spelling of 8672991 in words is "eight million, six hundred seventy-two thousand, nine hundred ninety-one".