90215985 has 16 divisors (see below), whose sum is σ = 145105920. Its totient is φ = 47861760.

The previous prime is 90215977. The next prime is 90215987. The reversal of 90215985 is 58951209.

It is not a de Polignac number, because 90215985 - 2³ = 90215977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90215987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12880 + ... + 18609.

It is an arithmetic number, because the mean of its divisors is an integer number (9069120).

Almost surely, 2^90215985 is an apocalyptic number.

It is an amenable number.

90215985 is a deficient number, since it is larger than the sum of its proper divisors (54889935).

90215985 is a wasteful number, since it uses less digits than its factorization.

90215985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31688.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 90215985 is about 9498.2095681239. The cubic root of 90215985 is about 448.4986757504.

The spelling of 90215985 in words is "ninety million, two hundred fifteen thousand, nine hundred eighty-five".