90900215500 has 96 divisors (see below), whose sum is σ = 215093406528. Its totient is φ = 33425280000.

The previous prime is 90900215467. The next prime is 90900215501. The reversal of 90900215500 is 551200909.

It is not an unprimeable number, because it can be changed into a prime (90900215501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241150 + ... + 489850.

It is an arithmetic number, because the mean of its divisors is an integer number (2240556318).

Almost surely, 2^90900215500 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 90900215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107546703264).

90900215500 is an abundant number, since it is smaller than the sum of its proper divisors (124193191028).

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

90900215500 is a wasteful number, since it uses less digits than its factorization.

90900215500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248780 (or 248768 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 31.

The spelling of 90900215500 in words is "ninety billion, nine hundred million, two hundred fifteen thousand, five hundred".