82578665 has 8 divisors (see below), whose sum is σ = 106717128. Its totient is φ = 60981120.

The previous prime is 82578653. The next prime is 82578667. The reversal of 82578665 is 56687528.

It can be written as a sum of positive squares in 4 ways, for example, as 802816 + 81775849 = 896^2 + 9043^2 .

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

It is not a de Polignac number, because 82578665 - 2¹⁰ = 82577641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82578667) 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, 635156 + ... + 635285.

It is an arithmetic number, because the mean of its divisors is an integer number (13339641).

Almost surely, 2^82578665 is an apocalyptic number.

It is an amenable number.

82578665 is a deficient number, since it is larger than the sum of its proper divisors (24138463).

82578665 is a wasteful number, since it uses less digits than its factorization.

82578665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270459.

The product of its digits is 806400, while the sum is 47.

The square root of 82578665 is about 9087.2803962462. The cubic root of 82578665 is about 435.4677049925.

The spelling of 82578665 in words is "eighty-two million, five hundred seventy-eight thousand, six hundred sixty-five".