90309565 has 12 divisors (see below), whose sum is σ = 114377724. Its totient is φ = 68443776.

The previous prime is 90309553. The next prime is 90309581. The reversal of 90309565 is 56590309.

It can be written as a sum of positive squares in 2 ways, for example, as 14584761 + 75724804 = 3819^2 + 8702^2 .

It is not a de Polignac number, because 90309565 - 2⁵ = 90309533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23212 + ... + 26821.

It is an arithmetic number, because the mean of its divisors is an integer number (9531477).

Almost surely, 2^90309565 is an apocalyptic number.

90309565 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

90309565 is a deficient number, since it is larger than the sum of its proper divisors (24068159).

90309565 is a wasteful number, since it uses less digits than its factorization.

90309565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50076 (or 50057 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 90309565 is about 9503.1344828956. The cubic root of 90309565 is about 448.6536963290.

The spelling of 90309565 in words is "ninety million, three hundred nine thousand, five hundred sixty-five".