90603985 has 4 divisors (see below), whose sum is σ = 108724788. Its totient is φ = 72483184.

The previous prime is 90603949. The next prime is 90604021. The reversal of 90603985 is 58930609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58930609 = 19 ⋅3101611.

It is an interprime number because it is at equal distance from previous prime (90603949) and next prime (90604021).

It can be written as a sum of positive squares in 2 ways, for example, as 34668544 + 55935441 = 5888^2 + 7479^2 .

It is a cyclic number.

It is not a de Polignac number, because 90603985 - 2⁷ = 90603857 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9060394 + ... + 9060403.

It is an arithmetic number, because the mean of its divisors is an integer number (27181197).

Almost surely, 2^90603985 is an apocalyptic number.

It is an amenable number.

90603985 is a deficient number, since it is larger than the sum of its proper divisors (18120803).

90603985 is a wasteful number, since it uses less digits than its factorization.

90603985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18120802.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 90603985 is about 9518.6125564601. The cubic root of 90603985 is about 449.1407223887.

The spelling of 90603985 in words is "ninety million, six hundred three thousand, nine hundred eighty-five".