82871685 has 72 divisors (see below), whose sum is σ = 164950344. Its totient is φ = 38338560.

The previous prime is 82871681. The next prime is 82871731. The reversal of 82871685 is 58617828.

It can be written as a sum of positive squares in 12 ways, for example, as 17164449 + 65707236 = 4143^2 + 8106^2 .

It is not a de Polignac number, because 82871685 - 2² = 82871681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 82871685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82871681) 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 71 ways as a sum of consecutive naturals, for example, 128965 + ... + 129605.

It is an arithmetic number, because the mean of its divisors is an integer number (2290977).

Almost surely, 2^82871685 is an apocalyptic number.

82871685 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

82871685 is a deficient number, since it is larger than the sum of its proper divisors (82078659).

82871685 is a wasteful number, since it uses less digits than its factorization.

82871685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 679 counting only the distinct ones).

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

The square root of 82871685 is about 9103.3886547813. The cubic root of 82871685 is about 435.9821644220.

The spelling of 82871685 in words is "eighty-two million, eight hundred seventy-one thousand, six hundred eighty-five".