85864128939 has 24 divisors (see below), whose sum is σ = 130623689040. Its totient is φ = 54200881728.

The previous prime is 85864128937. The next prime is 85864128943. The reversal of 85864128939 is 93982146858.

85864128939 is a `hidden beast` number, since 8 + 586 + 4 + 12 + 8 + 9 + 39 = 666.

It is not a de Polignac number, because 85864128939 - 2¹ = 85864128937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85864128937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187209 + ... + 454725.

It is an arithmetic number, because the mean of its divisors is an integer number (5442653710).

Almost surely, 2^85864128939 is an apocalyptic number.

85864128939 is a deficient number, since it is larger than the sum of its proper divisors (44759560101).

85864128939 is a wasteful number, since it uses less digits than its factorization.

85864128939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269419 (or 269416 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 85864128939 in words is "eighty-five billion, eight hundred sixty-four million, one hundred twenty-eight thousand, nine hundred thirty-nine".