90806605 has 32 divisors (see below), whose sum is σ = 123638400. Its totient is φ = 63608832.

The previous prime is 90806587. The next prime is 90806623. The reversal of 90806605 is 50660809.

It is an interprime number because it is at equal distance from previous prime (90806587) and next prime (90806623).

It is not a de Polignac number, because 90806605 - 2¹¹ = 90804557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94809 + ... + 95761.

It is an arithmetic number, because the mean of its divisors is an integer number (3863700).

Almost surely, 2^90806605 is an apocalyptic number.

90806605 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

90806605 is the 4765-th decagonal number.

It is an amenable number.

90806605 is a deficient number, since it is larger than the sum of its proper divisors (32831795).

90806605 is a wasteful number, since it uses less digits than its factorization.

90806605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 90806605 is about 9529.2499704856. The cubic root of 90806605 is about 449.4752813983.

The spelling of 90806605 in words is "ninety million, eight hundred six thousand, six hundred five".