82756621 has 2 divisors, whose sum is σ = 82756622. Its totient is φ = 82756620.

The previous prime is 82756589. The next prime is 82756637. The reversal of 82756621 is 12665728.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74200996 + 8555625 = 8614^2 + 2925^2 .

It is a cyclic number.

It is not a de Polignac number, because 82756621 - 2⁵ = 82756589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82756021) 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 as a sum of consecutive naturals, namely, 41378310 + 41378311.

It is an arithmetic number, because the mean of its divisors is an integer number (41378311).

Almost surely, 2^82756621 is an apocalyptic number.

It is an amenable number.

82756621 is a deficient number, since it is larger than the sum of its proper divisors (1).

82756621 is an equidigital number, since it uses as much as digits as its factorization.

82756621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 82756621 is about 9097.0666151238. The cubic root of 82756621 is about 435.7802897309.

The spelling of 82756621 in words is "eighty-two million, seven hundred fifty-six thousand, six hundred twenty-one".