90171270 has 192 divisors, whose sum is σ = 287539200. Its totient is φ = 19559232.

The previous prime is 90171253. The next prime is 90171287. The reversal of 90171270 is 7217109.

It is an interprime number because it is at equal distance from previous prime (90171253) and next prime (90171287).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 709947 + ... + 710073.

It is an arithmetic number, because the mean of its divisors is an integer number (1497600).

Almost surely, 2^90171270 is an apocalyptic number.

90171270 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 90171270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143769600).

90171270 is an abundant number, since it is smaller than the sum of its proper divisors (197367930).

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

90171270 is a wasteful number, since it uses less digits than its factorization.

90171270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 90171270 is about 9495.8554117046. The cubic root of 90171270 is about 448.4245649650.

Adding to 90171270 its reverse (7217109), we get a palindrome (97388379).

The spelling of 90171270 in words is "ninety million, one hundred seventy-one thousand, two hundred seventy".