90909091026 has 48 divisors (see below), whose sum is σ = 212327519040. Its totient is φ = 27944822880.

The previous prime is 90909090977. The next prime is 90909091027. The reversal of 90909091026 is 62019090909.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90909091027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52845 + ... + 429663.

It is an arithmetic number, because the mean of its divisors is an integer number (4423489980).

Almost surely, 2^90909091026 is an apocalyptic number.

90909091026 is an abundant number, since it is smaller than the sum of its proper divisors (121418428014).

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

90909091026 is a wasteful number, since it uses less digits than its factorization.

90909091026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377871 (or 377868 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The spelling of 90909091026 in words is "ninety billion, nine hundred nine million, ninety-one thousand, twenty-six".