82638665 has 8 divisors (see below), whose sum is σ = 100189320. Its totient is φ = 65428992.

The previous prime is 82638637. The next prime is 82638667. The reversal of 82638665 is 56683628.

It can be written as a sum of positive squares in 4 ways, for example, as 4280761 + 78357904 = 2069^2 + 8852^2 .

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 82638665 - 2¹⁶ = 82573129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82638667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84710 + ... + 85679.

It is an arithmetic number, because the mean of its divisors is an integer number (12523665).

Almost surely, 2^82638665 is an apocalyptic number.

It is an amenable number.

82638665 is a deficient number, since it is larger than the sum of its proper divisors (17550655).

82638665 is a wasteful number, since it uses less digits than its factorization.

82638665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170491.

The product of its digits is 414720, while the sum is 44.

The square root of 82638665 is about 9090.5811145383. The cubic root of 82638665 is about 435.5731468230.

The spelling of 82638665 in words is "eighty-two million, six hundred thirty-eight thousand, six hundred sixty-five".