90197705 has 16 divisors (see below), whose sum is σ = 118166160. Its totient is φ = 65691648.

The previous prime is 90197689. The next prime is 90197707. The reversal of 90197705 is 50779109.

It can be written as a sum of positive squares in 8 ways, for example, as 175561 + 90022144 = 419^2 + 9488^2 .

It is a cyclic number.

It is not a de Polignac number, because 90197705 - 2⁴ = 90197689 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90197707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4760 + ... + 14249.

It is an arithmetic number, because the mean of its divisors is an integer number (7385385).

Almost surely, 2^90197705 is an apocalyptic number.

It is an amenable number.

90197705 is a deficient number, since it is larger than the sum of its proper divisors (27968455).

90197705 is a wasteful number, since it uses less digits than its factorization.

90197705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19100.

The product of its (nonzero) digits is 19845, while the sum is 38.

The square root of 90197705 is about 9497.2472327512. The cubic root of 90197705 is about 448.4683813793.

The spelling of 90197705 in words is "ninety million, one hundred ninety-seven thousand, seven hundred five".