90765993 has 4 divisors (see below), whose sum is σ = 121021328. Its totient is φ = 60510660.

The previous prime is 90765989. The next prime is 90766031. The reversal of 90765993 is 39956709.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90765993 - 2² = 90765989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90765943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15127663 + ... + 15127668.

It is an arithmetic number, because the mean of its divisors is an integer number (30255332).

Almost surely, 2^90765993 is an apocalyptic number.

It is an amenable number.

90765993 is a deficient number, since it is larger than the sum of its proper divisors (30255335).

90765993 is a wasteful number, since it uses less digits than its factorization.

90765993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30255334.

The product of its (nonzero) digits is 459270, while the sum is 48.

The square root of 90765993 is about 9527.1188194543. The cubic root of 90765993 is about 449.4082642025.

The spelling of 90765993 in words is "ninety million, seven hundred sixty-five thousand, nine hundred ninety-three".