90987 has 8 divisors (see below), whose sum is σ = 130704. Its totient is φ = 55968.

The previous prime is 90977. The next prime is 90989. The reversal of 90987 is 78909.

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

It is not a de Polignac number, because 90987 - 2⁴ = 90971 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90987.

It is not an unprimeable number, because it can be changed into a prime (90989) 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, 1128 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (16338).

2⁹⁰⁹⁸⁷ is an apocalyptic number.

90987 is a deficient number, since it is larger than the sum of its proper divisors (39717).

90987 is a wasteful number, since it uses less digits than its factorization.

90987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 90987 is about 301.6405145202. The cubic root of 90987 is about 44.9772724739.

The spelling of 90987 in words is "ninety thousand, nine hundred eighty-seven".