85631218 has 8 divisors (see below), whose sum is σ = 128493612. Its totient is φ = 42800016.

The previous prime is 85631201. The next prime is 85631219. The reversal of 85631218 is 81213658.

It can be written as a sum of positive squares in 2 ways, for example, as 61355889 + 24275329 = 7833^2 + 4927^2 .

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

It is not an unprimeable number, because it can be changed into a prime (85631219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096 + ... + 13132.

Almost surely, 2^85631218 is an apocalyptic number.

85631218 is a deficient number, since it is larger than the sum of its proper divisors (42862394).

85631218 is a wasteful number, since it uses less digits than its factorization.

85631218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596.

The product of its digits is 11520, while the sum is 34.

The square root of 85631218 is about 9253.7137409799. The cubic root of 85631218 is about 440.7686598480.

It can be divided in two parts, 85631 and 218, that added together give a square (85849 = 293²).

The spelling of 85631218 in words is "eighty-five million, six hundred thirty-one thousand, two hundred eighteen".