85781223 has 12 divisors (see below), whose sum is σ = 135170568. Its totient is φ = 51988560.

The previous prime is 85781183. The next prime is 85781243. The reversal of 85781223 is 32218758.

It is not a de Polignac number, because 85781223 - 2¹³ = 85773031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85781243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433140 + ... + 433337.

It is an arithmetic number, because the mean of its divisors is an integer number (11264214).

Almost surely, 2^85781223 is an apocalyptic number.

85781223 is a deficient number, since it is larger than the sum of its proper divisors (49389345).

85781223 is a wasteful number, since it uses less digits than its factorization.

85781223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866494 (or 866491 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 85781223 is about 9261.8153188238. The cubic root of 85781223 is about 441.0258827575.

It can be divided in two parts, 8578 and 1223, that added together give a square (9801 = 99²).

The spelling of 85781223 in words is "eighty-five million, seven hundred eighty-one thousand, two hundred twenty-three".