90857217 has 16 divisors (see below), whose sum is σ = 132491520. Its totient is φ = 54925200.

The previous prime is 90857213. The next prime is 90857219. The reversal of 90857217 is 71275809.

It is not a de Polignac number, because 90857217 - 2² = 90857213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90857213) 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 15 ways as a sum of consecutive naturals, for example, 10542 + ... + 17112.

It is an arithmetic number, because the mean of its divisors is an integer number (8280720).

Almost surely, 2^90857217 is an apocalyptic number.

It is an amenable number.

90857217 is a deficient number, since it is larger than the sum of its proper divisors (41634303).

90857217 is a wasteful number, since it uses less digits than its factorization.

90857217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 90857217 is about 9531.9052135447. The cubic root of 90857217 is about 449.5587724536.

The spelling of 90857217 in words is "ninety million, eight hundred fifty-seven thousand, two hundred seventeen".