82857861 has 24 divisors (see below), whose sum is σ = 123098976. Its totient is φ = 53676000.

The previous prime is 82857839. The next prime is 82857869. The reversal of 82857861 is 16875828.

It is not a de Polignac number, because 82857861 - 2¹⁷ = 82726789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82857869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96711 + ... + 97563.

It is an arithmetic number, because the mean of its divisors is an integer number (5129124).

Almost surely, 2^82857861 is an apocalyptic number.

It is an amenable number.

82857861 is a deficient number, since it is larger than the sum of its proper divisors (40241115).

82857861 is a wasteful number, since it uses less digits than its factorization.

82857861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153 (or 1150 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 82857861 is about 9102.6293454144. The cubic root of 82857861 is about 435.9579207068.

The spelling of 82857861 in words is "eighty-two million, eight hundred fifty-seven thousand, eight hundred sixty-one".