8758991 has 4 divisors (see below), whose sum is σ = 8791584. Its totient is φ = 8726400.

The previous prime is 8758987. The next prime is 8758993. The reversal of 8758991 is 1998578.

It is a happy number.

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 8758991 - 2² = 8758987 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 (8758993) 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, 15890 + ... + 16431.

It is an arithmetic number, because the mean of its divisors is an integer number (2197896).

Almost surely, 2^8758991 is an apocalyptic number.

8758991 is a deficient number, since it is larger than the sum of its proper divisors (32593).

8758991 is a wasteful number, since it uses less digits than its factorization.

8758991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32592.

The product of its digits is 181440, while the sum is 47.

The square root of 8758991 is about 2959.5592577274. The cubic root of 8758991 is about 206.1348207841.

The spelling of 8758991 in words is "eight million, seven hundred fifty-eight thousand, nine hundred ninety-one".