82578643 has 8 divisors (see below), whose sum is σ = 94497120. Its totient is φ = 70690560.

The previous prime is 82578623. The next prime is 82578647. The reversal of 82578643 is 34687528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82578643 - 2⁹ = 82578131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82578643.

It is not an unprimeable number, because it can be changed into a prime (82578647) 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 7 ways as a sum of consecutive naturals, for example, 1438 + ... + 12931.

It is an arithmetic number, because the mean of its divisors is an integer number (11812140).

Almost surely, 2^82578643 is an apocalyptic number.

82578643 is a deficient number, since it is larger than the sum of its proper divisors (11918477).

82578643 is a wasteful number, since it uses less digits than its factorization.

82578643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15197.

The product of its digits is 322560, while the sum is 43.

The square root of 82578643 is about 9087.2791857629. The cubic root of 82578643 is about 435.4676663211.

It can be divided in two parts, 8257 and 8643, that added together give a square (16900 = 130²).

The spelling of 82578643 in words is "eighty-two million, five hundred seventy-eight thousand, six hundred forty-three".