90245249705 has 16 divisors (see below), whose sum is σ = 118267236864. Its totient is φ = 65704013760.

The previous prime is 90245249701. The next prime is 90245249749. The reversal of 90245249705 is 50794254209.

It is a happy number.

It is not a de Polignac number, because 90245249705 - 2² = 90245249701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90245249705.

It is not an unprimeable number, because it can be changed into a prime (90245249701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9772769 + ... + 9781998.

It is an arithmetic number, because the mean of its divisors is an integer number (7391702304).

Almost surely, 2^90245249705 is an apocalyptic number.

It is an amenable number.

90245249705 is a deficient number, since it is larger than the sum of its proper divisors (28021987159).

90245249705 is a wasteful number, since it uses less digits than its factorization.

90245249705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19554856.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 90245249705 in words is "ninety billion, two hundred forty-five million, two hundred forty-nine thousand, seven hundred five".