90885217 has 8 divisors (see below), whose sum is σ = 94991400. Its totient is φ = 86843904.

The previous prime is 90885163. The next prime is 90885229. The reversal of 90885217 is 71258809.

It can be written as a sum of positive squares in 4 ways, for example, as 31764496 + 59120721 = 5636^2 + 7689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90885217 - 2¹⁹ = 90360929 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 90885217.

It is not an unprimeable number, because it can be changed into a prime (90885257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13342 + ... + 18967.

It is an arithmetic number, because the mean of its divisors is an integer number (11873925).

Almost surely, 2^90885217 is an apocalyptic number.

90885217 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

90885217 is a deficient number, since it is larger than the sum of its proper divisors (4106183).

90885217 is a wasteful number, since it uses less digits than its factorization.

90885217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32435.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 90885217 is about 9533.3738518952. The cubic root of 90885217 is about 449.6049487626.

The spelling of 90885217 in words is "ninety million, eight hundred eighty-five thousand, two hundred seventeen".