90206791017 has 32 divisors (see below), whose sum is σ = 145650923520. Its totient is φ = 48510316800.

The previous prime is 90206791013. The next prime is 90206791027. The reversal of 90206791017 is 71019760209.

It is a happy number.

It is not a de Polignac number, because 90206791017 - 2² = 90206791013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90206791017.

It is not an unprimeable number, because it can be changed into a prime (90206791013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 688368 + ... + 808865.

It is an arithmetic number, because the mean of its divisors is an integer number (4551591360).

Almost surely, 2^90206791017 is an apocalyptic number.

It is an amenable number.

90206791017 is a deficient number, since it is larger than the sum of its proper divisors (55444132503).

90206791017 is a wasteful number, since it uses less digits than its factorization.

90206791017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497413.

The product of its (nonzero) digits is 47628, while the sum is 42.

The spelling of 90206791017 in words is "ninety billion, two hundred six million, seven hundred ninety-one thousand, seventeen".