85218315 has 64 divisors (see below), whose sum is σ = 169344000. Its totient is φ = 35633664.

The previous prime is 85218313. The next prime is 85218359. The reversal of 85218315 is 51381258.

It is a happy number.

It is not a de Polignac number, because 85218315 - 2¹ = 85218313 is a prime.

It is a super-2 number, since 2×85218315² = 14524322422878450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85218313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 203176 + ... + 203594.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 2^85218315 is an apocalyptic number.

85218315 is a deficient number, since it is larger than the sum of its proper divisors (84125685).

85218315 is a wasteful number, since it uses less digits than its factorization.

85218315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its digits is 9600, while the sum is 33.

The square root of 85218315 is about 9231.3766578989. The cubic root of 85218315 is about 440.0590743686.

It can be divided in two parts, 8521 and 8315, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 85218315 in words is "eighty-five million, two hundred eighteen thousand, three hundred fifteen".