90217986 has 8 divisors (see below), whose sum is σ = 180435984. Its totient is φ = 30072660.

The previous prime is 90217973. The next prime is 90217987. The reversal of 90217986 is 68971209.

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

90217986 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90217987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7518160 + ... + 7518171.

It is an arithmetic number, because the mean of its divisors is an integer number (22554498).

Almost surely, 2^90217986 is an apocalyptic number.

90217986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90217986 is a wasteful number, since it uses less digits than its factorization.

90217986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15036336.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 90217986 is about 9498.3149031815. The cubic root of 90217986 is about 448.5019916418.

The spelling of 90217986 in words is "ninety million, two hundred seventeen thousand, nine hundred eighty-six".