90101100 has 72 divisors (see below), whose sum is σ = 262014480. Its totient is φ = 23905280.

The previous prime is 90101047. The next prime is 90101101. The reversal of 90101100 is 110109.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (90101101) 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, 69256 + ... + 70544.

It is an arithmetic number, because the mean of its divisors is an integer number (3639090).

Almost surely, 2^90101100 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 90101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131007240).

90101100 is an abundant number, since it is smaller than the sum of its proper divisors (171913380).

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

90101100 is a wasteful number, since it uses less digits than its factorization.

90101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1532 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 90101100 is about 9492.1599227994. The cubic root of 90101100 is about 448.3082155728.

Adding to 90101100 its reverse (110109), we get a palindrome (90211209).

The spelling of 90101100 in words is "ninety million, one hundred one thousand, one hundred".