90985801844 has 24 divisors (see below), whose sum is σ = 189883413888. Its totient is φ = 37298527200.

The previous prime is 90985801811. The next prime is 90985801853. The reversal of 90985801844 is 44810858909.

It is a super-2 number, since 2×90985801844² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90985801844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70640507 + ... + 70641794.

It is an arithmetic number, because the mean of its divisors is an integer number (7911808912).

Almost surely, 2^90985801844 is an apocalyptic number.

It is an amenable number.

90985801844 is an abundant number, since it is smaller than the sum of its proper divisors (98897612044).

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

90985801844 is a wasteful number, since it uses less digits than its factorization.

90985801844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141282335 (or 141282333 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 90985801844 in words is "ninety billion, nine hundred eighty-five million, eight hundred one thousand, eight hundred forty-four".