82640479 has 4 divisors (see below), whose sum is σ = 82878984. Its totient is φ = 82401976.

The previous prime is 82640473. The next prime is 82640483. The reversal of 82640479 is 97404628.

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 82640479 - 2⁹ = 82639967 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82640473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118732 + ... + 119425.

It is an arithmetic number, because the mean of its divisors is an integer number (20719746).

Almost surely, 2^82640479 is an apocalyptic number.

82640479 is a deficient number, since it is larger than the sum of its proper divisors (238505).

82640479 is a wasteful number, since it uses less digits than its factorization.

82640479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238504.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 82640479 is about 9090.6808875903. The cubic root of 82640479 is about 435.5763338861.

The spelling of 82640479 in words is "eighty-two million, six hundred forty thousand, four hundred seventy-nine".