90170520 has 64 divisors (see below), whose sum is σ = 295107840. Its totient is φ = 21859200.

The previous prime is 90170503. The next prime is 90170539. The reversal of 90170520 is 2507109.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32836 + ... + 35475.

It is an arithmetic number, because the mean of its divisors is an integer number (4611060).

Almost surely, 2^90170520 is an apocalyptic number.

It is an amenable number.

90170520 is an abundant number, since it is smaller than the sum of its proper divisors (204937320).

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

90170520 is a wasteful number, since it uses less digits than its factorization.

90170520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68336 (or 68332 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 90170520 is about 9495.8159207095. The cubic root of 90170520 is about 448.4233217037.

Adding to 90170520 its reverse (2507109), we get a palindrome (92677629).

The spelling of 90170520 in words is "ninety million, one hundred seventy thousand, five hundred twenty".