90436561684 has 72 divisors (see below), whose sum is σ = 193880100960. Its totient is φ = 36702033984.

The previous prime is 90436561681. The next prime is 90436561717. The reversal of 90436561684 is 48616563409.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90436561681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11477154 + ... + 11485030.

It is an arithmetic number, because the mean of its divisors is an integer number (2692779180).

Almost surely, 2^90436561684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90436561684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96940050480).

90436561684 is an abundant number, since it is smaller than the sum of its proper divisors (103443539276).

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

90436561684 is a wasteful number, since it uses less digits than its factorization.

90436561684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10997 (or 10988 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 90436561684 in words is "ninety billion, four hundred thirty-six million, five hundred sixty-one thousand, six hundred eighty-four".