90908449812 has 36 divisors (see below), whose sum is σ = 229820097780. Its totient is φ = 30299686272.

The previous prime is 90908449811. The next prime is 90908449817. The reversal of 90908449812 is 21894480909.

It can be written as a sum of positive squares in 2 ways, for example, as 53336054916 + 37572394896 = 230946^2 + 193836^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90908449811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237088 + ... + 487880.

It is an arithmetic number, because the mean of its divisors is an integer number (6383891605).

Almost surely, 2^90908449812 is an apocalyptic number.

It is an amenable number.

90908449812 is an abundant number, since it is smaller than the sum of its proper divisors (138911647968).

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

90908449812 is a wasteful number, since it uses less digits than its factorization.

90908449812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260872 (or 260867 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 90908449812 in words is "ninety billion, nine hundred eight million, four hundred forty-nine thousand, eight hundred twelve".