23091090 has 64 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 5551040.

The previous prime is 23091073. The next prime is 23091091. The reversal of 23091090 is 9019032.

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 23091090.

It is not an unprimeable number, because it can be changed into a prime (23091091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54901 + ... + 55319.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^23091090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23091090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

23091090 is an abundant number, since it is smaller than the sum of its proper divisors (37872750).

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

23091090 is a wasteful number, since it uses less digits than its factorization.

23091090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 23091090 is about 4805.3189280213. The cubic root of 23091090 is about 284.7616351054.

The spelling of 23091090 in words is "twenty-three million, ninety-one thousand, ninety".