90172726205 has 8 divisors (see below), whose sum is σ = 108245110104. Its totient is φ = 72112955200.

The previous prime is 90172726181. The next prime is 90172726243. The reversal of 90172726205 is 50262727109.

It can be written as a sum of positive squares in 4 ways, for example, as 39250741924 + 50921984281 = 198118^2 + 225659^2 .

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

It is not a de Polignac number, because 90172726205 - 2¹² = 90172722109 is a prime.

It is a super-2 number, since 2×90172726205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3137486 + ... + 3166095.

It is an arithmetic number, because the mean of its divisors is an integer number (13530638763).

Almost surely, 2^90172726205 is an apocalyptic number.

It is an amenable number.

90172726205 is a deficient number, since it is larger than the sum of its proper divisors (18072383899).

90172726205 is a wasteful number, since it uses less digits than its factorization.

90172726205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306447.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 90172726205 in words is "ninety billion, one hundred seventy-two million, seven hundred twenty-six thousand, two hundred five".