82578971 has 4 divisors (see below), whose sum is σ = 82664472. Its totient is φ = 82493472.

The previous prime is 82578919. The next prime is 82579027. The reversal of 82578971 is 17987528.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82578971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82578071) 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, 41285 + ... + 43238.

It is an arithmetic number, because the mean of its divisors is an integer number (20666118).

Almost surely, 2^82578971 is an apocalyptic number.

82578971 is a deficient number, since it is larger than the sum of its proper divisors (85501).

82578971 is an equidigital number, since it uses as much as digits as its factorization.

82578971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85500.

The product of its digits is 282240, while the sum is 47.

The square root of 82578971 is about 9087.2972329511. The cubic root of 82578971 is about 435.4682428754.

The spelling of 82578971 in words is "eighty-two million, five hundred seventy-eight thousand, nine hundred seventy-one".