8779991 has 8 divisors (see below), whose sum is σ = 9602064. Its totient is φ = 7961920.

The previous prime is 8779961. The next prime is 8779993. The reversal of 8779991 is 1999778.

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 8779991 - 2²² = 4585687 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 (8779993) 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, 5411 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (1200258).

Almost surely, 2^8779991 is an apocalyptic number.

8779991 is a deficient number, since it is larger than the sum of its proper divisors (822073).

8779991 is a wasteful number, since it uses less digits than its factorization.

8779991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001.

The product of its digits is 285768, while the sum is 50.

The square root of 8779991 is about 2963.1049593290. The cubic root of 8779991 is about 206.2994278843.

The spelling of 8779991 in words is "eight million, seven hundred seventy-nine thousand, nine hundred ninety-one".