90909910 has 32 divisors (see below), whose sum is σ = 201402432. Its totient is φ = 28771200.

The previous prime is 90909901. The next prime is 90909919. The reversal of 90909910 is 1990909.

It is an interprime number because it is at equal distance from previous prime (90909901) and next prime (90909919).

It is a super-2 number, since 2×90909910² = 16529223472416200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90909910.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49041 + ... + 50860.

It is an arithmetic number, because the mean of its divisors is an integer number (6293826).

Almost surely, 2^90909910 is an apocalyptic number.

90909910 is an abundant number, since it is smaller than the sum of its proper divisors (110492522).

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

90909910 is a wasteful number, since it uses less digits than its factorization.

90909910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99928.

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 90909910 is about 9534.6688458488. The cubic root of 90909910 is about 449.6456634503.

It can be divided in two parts, 90909 and 910, that added together give a palindrome (91819).

The spelling of 90909910 in words is "ninety million, nine hundred nine thousand, nine hundred ten".