90909090909090 has 96 divisors (see below), whose sum is σ = 237403921248000. Its totient is φ = 24135772227840.

The previous prime is 90909090909071. The next prime is 90909090909121. The reversal of 90909090909090 is 9090909090909.

90909090909090 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

90909090909090 is an undulating number in base 10.

90909090909090 is a modest number, since divided by 90909090 gives 909090 as remainder.

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, 99545445 + ... + 100454535.

It is an arithmetic number, because the mean of its divisors is an integer number (2472957513000).

Almost surely, 2^{90909090909090} is an apocalyptic number.

90909090909090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90909090909090 is an abundant number, since it is smaller than the sum of its proper divisors (146494830338910).

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

90909090909090 is a wasteful number, since it uses less digits than its factorization.

90909090909090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913992 (or 913989 counting only the distinct ones).

The product of its (nonzero) digits is 4782969, while the sum is 63.

Adding to 90909090909090 its reverse (9090909090909), we get a palindrome (99999999999999).

The spelling of 90909090909090 in words is "ninety trillion, nine hundred nine billion, ninety million, nine hundred nine thousand, ninety".