8991087 has 8 divisors (see below), whose sum is σ = 13700736. Its totient is φ = 5137752.

The previous prime is 8991077. The next prime is 8991089. The reversal of 8991087 is 7801998.

8991087 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8991087 - 2⁸ = 8990831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991089) 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, 214053 + ... + 214094.

It is an arithmetic number, because the mean of its divisors is an integer number (1712592).

Almost surely, 2^8991087 is an apocalyptic number.

8991087 is a deficient number, since it is larger than the sum of its proper divisors (4709649).

8991087 is a wasteful number, since it uses less digits than its factorization.

8991087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428157.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 8991087 is about 2998.5141320327. The cubic root of 8991087 is about 207.9396937471.

The spelling of 8991087 in words is "eight million, nine hundred ninety-one thousand, eighty-seven".