90170785 has 32 divisors (see below), whose sum is σ = 116379648. Its totient is φ = 66951360.

The previous prime is 90170783. The next prime is 90170791. The reversal of 90170785 is 58707109.

It is not a de Polignac number, because 90170785 - 2¹ = 90170783 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90170783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553114 + ... + 553276.

It is an arithmetic number, because the mean of its divisors is an integer number (3636864).

Almost surely, 2^90170785 is an apocalyptic number.

It is an amenable number.

90170785 is a deficient number, since it is larger than the sum of its proper divisors (26208863).

90170785 is a wasteful number, since it uses less digits than its factorization.

90170785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 90170785 is about 9495.8298742132. The cubic root of 90170785 is about 448.4237609901.

The spelling of 90170785 in words is "ninety million, one hundred seventy thousand, seven hundred eighty-five".