90205765 has 8 divisors (see below), whose sum is σ = 116573688. Its totient is φ = 66613440.

The previous prime is 90205729. The next prime is 90205783. The reversal of 90205765 is 56750209.

It can be written as a sum of positive squares in 4 ways, for example, as 3175524 + 87030241 = 1782^2 + 9329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90205765 - 2⁷ = 90205637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90205765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693826 + ... + 693955.

It is an arithmetic number, because the mean of its divisors is an integer number (14571711).

Almost surely, 2^90205765 is an apocalyptic number.

It is an amenable number.

90205765 is a deficient number, since it is larger than the sum of its proper divisors (26367923).

90205765 is a wasteful number, since it uses less digits than its factorization.

90205765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387799.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 90205765 is about 9497.6715567554. The cubic root of 90205765 is about 448.4817392487.

The spelling of 90205765 in words is "ninety million, two hundred five thousand, seven hundred sixty-five".