85155987 has 16 divisors (see below), whose sum is σ = 130699520. Its totient is φ = 48308832.

The previous prime is 85155979. The next prime is 85155989. The reversal of 85155987 is 78955158.

It is not a de Polignac number, because 85155987 - 2³ = 85155979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85155989) 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 15 ways as a sum of consecutive naturals, for example, 11668 + ... + 17505.

It is an arithmetic number, because the mean of its divisors is an integer number (8168720).

Almost surely, 2^85155987 is an apocalyptic number.

85155987 is a deficient number, since it is larger than the sum of its proper divisors (45543533).

85155987 is a wasteful number, since it uses less digits than its factorization.

85155987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29322.

The product of its digits is 504000, while the sum is 48.

The square root of 85155987 is about 9228.0001625488. Note that the first 3 decimals coincide. The cubic root of 85155987 is about 439.9517629627.

The spelling of 85155987 in words is "eighty-five million, one hundred fifty-five thousand, nine hundred eighty-seven".