82639477 has 8 divisors (see below), whose sum is σ = 84920472. Its totient is φ = 80371200.

The previous prime is 82639433. The next prime is 82639511. The reversal of 82639477 is 77493628.

It can be written as a sum of positive squares in 4 ways, for example, as 8145316 + 74494161 = 2854^2 + 8631^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82639477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82631477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10827 + ... + 16807.

It is an arithmetic number, because the mean of its divisors is an integer number (10615059).

Almost surely, 2^82639477 is an apocalyptic number.

It is an amenable number.

82639477 is a deficient number, since it is larger than the sum of its proper divisors (2280995).

82639477 is a wasteful number, since it uses less digits than its factorization.

82639477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6359.

The product of its digits is 508032, while the sum is 46.

The square root of 82639477 is about 9090.6257760398. The cubic root of 82639477 is about 435.5745734524.

The spelling of 82639477 in words is "eighty-two million, six hundred thirty-nine thousand, four hundred seventy-seven".