85857861 has 16 divisors (see below), whose sum is σ = 117218304. Its totient is φ = 55874544.

The previous prime is 85857859. The next prime is 85857869. The reversal of 85857861 is 16875858.

It is not a de Polignac number, because 85857861 - 2¹ = 85857859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85857861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85857869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90190 + ... + 91136.

It is an arithmetic number, because the mean of its divisors is an integer number (7326144).

Almost surely, 2^85857861 is an apocalyptic number.

It is an amenable number.

85857861 is a deficient number, since it is larger than the sum of its proper divisors (31360443).

85857861 is a wasteful number, since it uses less digits than its factorization.

85857861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

The product of its digits is 537600, while the sum is 48.

The square root of 85857861 is about 9265.9517050328. The cubic root of 85857861 is about 441.1571829801.

The spelling of 85857861 in words is "eighty-five million, eight hundred fifty-seven thousand, eight hundred sixty-one".