90855605 has 4 divisors (see below), whose sum is σ = 109026732. Its totient is φ = 72684480.

The previous prime is 90855601. The next prime is 90855607. The reversal of 90855605 is 50655809.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25472209 + 65383396 = 5047^2 + 8086^2 .

It is not a de Polignac number, because 90855605 - 2² = 90855601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90855601) 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, 9085556 + ... + 9085565.

It is an arithmetic number, because the mean of its divisors is an integer number (27256683).

Almost surely, 2^90855605 is an apocalyptic number.

It is an amenable number.

90855605 is a deficient number, since it is larger than the sum of its proper divisors (18171127).

90855605 is a wasteful number, since it uses less digits than its factorization.

90855605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18171126.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 90855605 is about 9531.8206550480. The cubic root of 90855605 is about 449.5561137287.

The spelling of 90855605 in words is "ninety million, eight hundred fifty-five thousand, six hundred five".