82638091 has 4 divisors (see below), whose sum is σ = 82663672. Its totient is φ = 82612512.

The previous prime is 82638089. The next prime is 82638097. The reversal of 82638091 is 19083628.

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

It is a cyclic number.

It is not a de Polignac number, because 82638091 - 2¹ = 82638089 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 82638091.

It is not an unprimeable number, because it can be changed into a prime (82638097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7101 + ... + 14686.

It is an arithmetic number, because the mean of its divisors is an integer number (20665918).

Almost surely, 2^82638091 is an apocalyptic number.

82638091 is a deficient number, since it is larger than the sum of its proper divisors (25581).

82638091 is a wasteful number, since it uses less digits than its factorization.

82638091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25580.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 82638091 is about 9090.5495433445. The cubic root of 82638091 is about 435.5721383380.

The spelling of 82638091 in words is "eighty-two million, six hundred thirty-eight thousand, ninety-one".