90170000 has 100 divisors (see below), whose sum is σ = 223128576. Its totient is φ = 35280000.

The previous prime is 90169951. The next prime is 90170009. The reversal of 90170000 is 7109.

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (90170009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 709937 + ... + 710063.

Almost surely, 2^90170000 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 90170000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111564288).

90170000 is an abundant number, since it is smaller than the sum of its proper divisors (132958576).

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

90170000 is a wasteful number, since it uses less digits than its factorization.

90170000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 63, while the sum is 17.

The square root of 90170000 is about 9495.7885401898. The cubic root of 90170000 is about 448.4224597051.

Adding to 90170000 its reverse (7109), we get a palindrome (90177109).

The spelling of 90170000 in words is "ninety million, one hundred seventy thousand".