82878871 has 4 divisors (see below), whose sum is σ = 84014272. Its totient is φ = 81743472.

The previous prime is 82878863. The next prime is 82878881. The reversal of 82878871 is 17887828.

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 82878871 - 2³ = 82878863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82878811) 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 3 ways as a sum of consecutive naturals, for example, 567591 + ... + 567736.

It is an arithmetic number, because the mean of its divisors is an integer number (21003568).

Almost surely, 2^82878871 is an apocalyptic number.

82878871 is a deficient number, since it is larger than the sum of its proper divisors (1135401).

82878871 is a wasteful number, since it uses less digits than its factorization.

82878871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135400.

The product of its digits is 401408, while the sum is 49.

The square root of 82878871 is about 9103.7833344165. The cubic root of 82878871 is about 435.9947657397.

The spelling of 82878871 in words is "eighty-two million, eight hundred seventy-eight thousand, eight hundred seventy-one".