85787221 has 8 divisors (see below), whose sum is σ = 92461824. Its totient is φ = 79123440.

The previous prime is 85787213. The next prime is 85787243. The reversal of 85787221 is 12278758.

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 85787221 - 2³ = 85787213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85787281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22560 + ... + 26086.

It is an arithmetic number, because the mean of its divisors is an integer number (11557728).

Almost surely, 2^85787221 is an apocalyptic number.

It is an amenable number.

85787221 is a deficient number, since it is larger than the sum of its proper divisors (6674603).

85787221 is a wasteful number, since it uses less digits than its factorization.

85787221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5411.

The product of its digits is 62720, while the sum is 40.

The square root of 85787221 is about 9262.1391157767. The cubic root of 85787221 is about 441.0361616643.

The spelling of 85787221 in words is "eighty-five million, seven hundred eighty-seven thousand, two hundred twenty-one".