90090840765 has 32 divisors (see below), whose sum is σ = 145612609920. Its totient is φ = 47561792256.

The previous prime is 90090840761. The next prime is 90090840767. The reversal of 90090840765 is 56704809009.

It is not a de Polignac number, because 90090840765 - 2² = 90090840761 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90090840761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 518454 + ... + 670056.

It is an arithmetic number, because the mean of its divisors is an integer number (4550394060).

Almost surely, 2^90090840765 is an apocalyptic number.

It is an amenable number.

90090840765 is a deficient number, since it is larger than the sum of its proper divisors (55521769155).

90090840765 is a wasteful number, since it uses less digits than its factorization.

90090840765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152013.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 90090840765 in words is "ninety billion, ninety million, eight hundred forty thousand, seven hundred sixty-five".