82689971 has 16 divisors (see below), whose sum is σ = 102246144. Its totient is φ = 65120544.

The previous prime is 82689949. The next prime is 82689973. The reversal of 82689971 is 17998628.

It is a cyclic number.

It is not a de Polignac number, because 82689971 - 2²² = 78495667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82689973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18656 + ... + 22658.

It is an arithmetic number, because the mean of its divisors is an integer number (6390384).

Almost surely, 2^82689971 is an apocalyptic number.

82689971 is a deficient number, since it is larger than the sum of its proper divisors (19556173).

82689971 is a wasteful number, since it uses less digits than its factorization.

82689971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250.

The product of its digits is 435456, while the sum is 50.

The square root of 82689971 is about 9093.4026084849. The cubic root of 82689971 is about 435.6632696595.

The spelling of 82689971 in words is "eighty-two million, six hundred eighty-nine thousand, nine hundred seventy-one".