85657987 has 4 divisors (see below), whose sum is σ = 85753336. Its totient is φ = 85562640.

The previous prime is 85657963. The next prime is 85658039. The reversal of 85657987 is 78975658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78975658 = 2 ⋅39487829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85657987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85657937) 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 3 ways as a sum of consecutive naturals, for example, 46314 + ... + 48127.

It is an arithmetic number, because the mean of its divisors is an integer number (21438334).

Almost surely, 2^85657987 is an apocalyptic number.

85657987 is a deficient number, since it is larger than the sum of its proper divisors (95349).

85657987 is an equidigital number, since it uses as much as digits as its factorization.

85657987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95348.

The product of its digits is 4233600, while the sum is 55.

The square root of 85657987 is about 9255.1600202266. The cubic root of 85657987 is about 440.8145843261.

The spelling of 85657987 in words is "eighty-five million, six hundred fifty-seven thousand, nine hundred eighty-seven".