90420985 has 16 divisors (see below), whose sum is σ = 113840640. Its totient is φ = 68850880.

The previous prime is 90420961. The next prime is 90420991. The reversal of 90420985 is 58902409.

It is not a de Polignac number, because 90420985 - 2¹⁵ = 90388217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5904 + ... + 14686.

It is an arithmetic number, because the mean of its divisors is an integer number (7115040).

Almost surely, 2^90420985 is an apocalyptic number.

It is an amenable number.

90420985 is a deficient number, since it is larger than the sum of its proper divisors (23419655).

90420985 is a wasteful number, since it uses less digits than its factorization.

90420985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8888.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 90420985 is about 9508.9949521493. The cubic root of 90420985 is about 448.8381302844.

The spelling of 90420985 in words is "ninety million, four hundred twenty thousand, nine hundred eighty-five".