90591090 has 48 divisors (see below), whose sum is σ = 222305472. Its totient is φ = 23626336.

The previous prime is 90591077. The next prime is 90591131. The reversal of 90591090 is 9019509.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65587 + ... + 66953.

It is an arithmetic number, because the mean of its divisors is an integer number (4631364).

Almost surely, 2^90591090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90591090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111152736).

90591090 is an abundant number, since it is smaller than the sum of its proper divisors (131714382).

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

90591090 is a wasteful number, since it uses less digits than its factorization.

90591090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 90591090 is about 9517.9351752363. The cubic root of 90591090 is about 449.1194137439.

The spelling of 90591090 in words is "ninety million, five hundred ninety-one thousand, ninety".