90770565 has 24 divisors (see below), whose sum is σ = 154285920. Its totient is φ = 45561088.

The previous prime is 90770557. The next prime is 90770567. The reversal of 90770565 is 56507709.

It is not a de Polignac number, because 90770565 - 2³ = 90770557 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90770567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6135 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (6428580).

Almost surely, 2^90770565 is an apocalyptic number.

It is an amenable number.

90770565 is a deficient number, since it is larger than the sum of its proper divisors (63515355).

90770565 is a wasteful number, since it uses less digits than its factorization.

90770565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20981 (or 20964 counting only the distinct ones).

The product of its (nonzero) digits is 66150, while the sum is 39.

The square root of 90770565 is about 9527.3587630571. The cubic root of 90770565 is about 449.4158098335.

The spelling of 90770565 in words is "ninety million, seven hundred seventy thousand, five hundred sixty-five".