82861643 has 4 divisors (see below), whose sum is σ = 83996808. Its totient is φ = 81726480.

The previous prime is 82861579. The next prime is 82861661. The reversal of 82861643 is 34616828.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82861643 - 2⁶ = 82861579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82861597 and 82861606.

It is not an unprimeable number, because it can be changed into a prime (82561643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567473 + ... + 567618.

It is an arithmetic number, because the mean of its divisors is an integer number (20999202).

Almost surely, 2^82861643 is an apocalyptic number.

82861643 is a deficient number, since it is larger than the sum of its proper divisors (1135165).

82861643 is a wasteful number, since it uses less digits than its factorization.

82861643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135164.

The product of its digits is 55296, while the sum is 38.

The square root of 82861643 is about 9102.8370852169. The cubic root of 82861643 is about 435.9645536231.

The spelling of 82861643 in words is "eighty-two million, eight hundred sixty-one thousand, six hundred forty-three".