85215819 has 8 divisors (see below), whose sum is σ = 122361232. Its totient is φ = 52440480.

The previous prime is 85215811. The next prime is 85215829. The reversal of 85215819 is 91851258.

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

It is not a de Polignac number, because 85215819 - 2³ = 85215811 is a prime.

It is a super-2 number, since 2×85215819² = 14523471615681522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2185021 = 85215819 / (8 + 5 + 2 + 1 + 5 + 8 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85215811) 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, 1092472 + ... + 1092549.

It is an arithmetic number, because the mean of its divisors is an integer number (15295154).

Almost surely, 2^85215819 is an apocalyptic number.

85215819 is a deficient number, since it is larger than the sum of its proper divisors (37145413).

85215819 is a wasteful number, since it uses less digits than its factorization.

85215819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185037.

The product of its digits is 28800, while the sum is 39.

The square root of 85215819 is about 9231.2414658051. The cubic root of 85215819 is about 440.0547779597.

The spelling of 85215819 in words is "eighty-five million, two hundred fifteen thousand, eight hundred nineteen".