90068905 has 4 divisors (see below), whose sum is σ = 108082692. Its totient is φ = 72055120.

The previous prime is 90068903. The next prime is 90068929. The reversal of 90068905 is 50986009.

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 66797929 + 23270976 = 8173^2 + 4824^2 .

It is not a de Polignac number, because 90068905 - 2¹ = 90068903 is a prime.

It is a super-2 number, since 2×90068905² = 16224815295798050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90068903) 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, 9006886 + ... + 9006895.

It is an arithmetic number, because the mean of its divisors is an integer number (27020673).

Almost surely, 2^90068905 is an apocalyptic number.

It is an amenable number.

90068905 is a deficient number, since it is larger than the sum of its proper divisors (18013787).

90068905 is a wasteful number, since it uses less digits than its factorization.

90068905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18013786.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 90068905 is about 9490.4638980400. The cubic root of 90068905 is about 448.2548125901.

The spelling of 90068905 in words is "ninety million, sixty-eight thousand, nine hundred five".