90170687 has 4 divisors (see below), whose sum is σ = 90229656. Its totient is φ = 90111720.

The previous prime is 90170671. The next prime is 90170693. The reversal of 90170687 is 78607109.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90170687 - 2⁴ = 90170671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90170687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90170387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27128 + ... + 30269.

It is an arithmetic number, because the mean of its divisors is an integer number (22557414).

Almost surely, 2^90170687 is an apocalyptic number.

90170687 is a deficient number, since it is larger than the sum of its proper divisors (58969).

90170687 is a wasteful number, since it uses less digits than its factorization.

90170687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58968.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 90170687 is about 9495.8247140520. The cubic root of 90170687 is about 448.4235985371.

The spelling of 90170687 in words is "ninety million, one hundred seventy thousand, six hundred eighty-seven".