90171912 has 16 divisors (see below), whose sum is σ = 225429840. Its totient is φ = 30057296.

The previous prime is 90171911. The next prime is 90171919. The reversal of 90171912 is 21917109.

It is a self number, because there is not a number n which added to its sum of digits gives 90171912.

It is not an unprimeable number, because it can be changed into a prime (90171911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1878558 + ... + 1878605.

It is an arithmetic number, because the mean of its divisors is an integer number (14089365).

Almost surely, 2^90171912 is an apocalyptic number.

It is an amenable number.

90171912 is an abundant number, since it is smaller than the sum of its proper divisors (135257928).

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

90171912 is a wasteful number, since it uses less digits than its factorization.

90171912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757172 (or 3757168 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 90171912 is about 9495.8892158660. The cubic root of 90171912 is about 448.4256291912.

The spelling of 90171912 in words is "ninety million, one hundred seventy-one thousand, nine hundred twelve".