90772865 has 8 divisors (see below), whose sum is σ = 109300968. Its totient is φ = 72369280.

The previous prime is 90772831. The next prime is 90772879. The reversal of 90772865 is 56827709.

It can be written as a sum of positive squares in 4 ways, for example, as 47831056 + 42941809 = 6916^2 + 6553^2 .

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

It is not a de Polignac number, because 90772865 - 2¹⁶ = 90707329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29516 + ... + 32445.

It is an arithmetic number, because the mean of its divisors is an integer number (13662621).

Almost surely, 2^90772865 is an apocalyptic number.

It is an amenable number.

90772865 is a deficient number, since it is larger than the sum of its proper divisors (18528103).

90772865 is a wasteful number, since it uses less digits than its factorization.

90772865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62259.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 90772865 is about 9527.4794673093. The cubic root of 90772865 is about 449.4196056589.

The spelling of 90772865 in words is "ninety million, seven hundred seventy-two thousand, eight hundred sixty-five".