90686909208 has 256 divisors, whose sum is σ = 279886233600. Its totient is φ = 23916372480.

The previous prime is 90686909179. The next prime is 90686909221. The reversal of 90686909208 is 80290968609.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53063458 + ... + 53065166.

It is an arithmetic number, because the mean of its divisors is an integer number (1093305600).

Almost surely, 2^90686909208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90686909208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139943116800).

90686909208 is an abundant number, since it is smaller than the sum of its proper divisors (189199324392).

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

90686909208 is a wasteful number, since it uses less digits than its factorization.

90686909208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222 (or 2218 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 90686909208 in words is "ninety billion, six hundred eighty-six million, nine hundred nine thousand, two hundred eight".