90245987 has 16 divisors (see below), whose sum is σ = 99936480. Its totient is φ = 80980992.

The previous prime is 90245977. The next prime is 90245989. The reversal of 90245987 is 78954209.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90245987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90245989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73793 + ... + 75005.

It is an arithmetic number, because the mean of its divisors is an integer number (6246030).

Almost surely, 2^90245987 is an apocalyptic number.

90245987 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

90245987 is a deficient number, since it is larger than the sum of its proper divisors (9690493).

90245987 is a wasteful number, since it uses less digits than its factorization.

90245987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 90245987 is about 9499.7887871257. The cubic root of 90245987 is about 448.5483874356.

The spelling of 90245987 in words is "ninety million, two hundred forty-five thousand, nine hundred eighty-seven".