89991287 has 8 divisors (see below), whose sum is σ = 91763472. Its totient is φ = 88228800.

The previous prime is 89991283. The next prime is 89991299. The reversal of 89991287 is 78219998.

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 89991287 - 2² = 89991283 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 (89991283) 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, 17963 + ... + 22419.

It is an arithmetic number, because the mean of its divisors is an integer number (11470434).

Almost surely, 2^89991287 is an apocalyptic number.

89991287 is a deficient number, since it is larger than the sum of its proper divisors (1772185).

89991287 is a wasteful number, since it uses less digits than its factorization.

89991287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4849.

The product of its digits is 653184, while the sum is 53.

The square root of 89991287 is about 9486.3737539694. The cubic root of 89991287 is about 448.1260125299.

The spelling of 89991287 in words is "eighty-nine million, nine hundred ninety-one thousand, two hundred eighty-seven".