85128615 has 48 divisors (see below), whose sum is σ = 173365920. Its totient is φ = 38096640.

The previous prime is 85128613. The next prime is 85128619. The reversal of 85128615 is 51682158.

It is not a de Polignac number, because 85128615 - 2¹ = 85128613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85128615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85128613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 180 + ... + 13049.

It is an arithmetic number, because the mean of its divisors is an integer number (3611790).

Almost surely, 2^85128615 is an apocalyptic number.

85128615 is an abundant number, since it is smaller than the sum of its proper divisors (88237305).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85128615 is a wasteful number, since it uses less digits than its factorization.

85128615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13264 (or 13261 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 85128615 is about 9226.5169484481. The cubic root of 85128615 is about 439.9046194770.

The spelling of 85128615 in words is "eighty-five million, one hundred twenty-eight thousand, six hundred fifteen".