90091000206 has 96 divisors (see below), whose sum is σ = 205057944000. Its totient is φ = 28548495360.

The previous prime is 90091000187. The next prime is 90091000247. The reversal of 90091000206 is 60200019009.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90091000206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10071696 + ... + 10080636.

It is an arithmetic number, because the mean of its divisors is an integer number (2136020250).

Almost surely, 2^90091000206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90091000206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102528972000).

90091000206 is an abundant number, since it is smaller than the sum of its proper divisors (114966943794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90091000206 is a wasteful number, since it uses less digits than its factorization.

90091000206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9274 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 90091000206 in words is "ninety billion, ninety-one million, two hundred six", and thus it is an aban number.