85840815 has 16 divisors (see below), whose sum is σ = 137513088. Its totient is φ = 45725856.

The previous prime is 85840813. The next prime is 85840819. The reversal of 85840815 is 51804858.

It is not a de Polignac number, because 85840815 - 2¹ = 85840813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85840813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11184 + ... + 17226.

It is an arithmetic number, because the mean of its divisors is an integer number (8594568).

Almost surely, 2^85840815 is an apocalyptic number.

85840815 is a deficient number, since it is larger than the sum of its proper divisors (51672273).

85840815 is a wasteful number, since it uses less digits than its factorization.

85840815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6998.

The product of its (nonzero) digits is 51200, while the sum is 39.

The square root of 85840815 is about 9265.0318402043. The cubic root of 85840815 is about 441.1279856417.

The spelling of 85840815 in words is "eighty-five million, eight hundred forty thousand, eight hundred fifteen".