82505779 has 2 divisors, whose sum is σ = 82505780. Its totient is φ = 82505778.

The previous prime is 82505749. The next prime is 82505791. The reversal of 82505779 is 97750528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82505779 - 2¹¹ = 82503731 is a prime.

It is not a weakly prime, because it can be changed into another prime (82505719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41252889 + 41252890.

It is an arithmetic number, because the mean of its divisors is an integer number (41252890).

Almost surely, 2^82505779 is an apocalyptic number.

82505779 is a deficient number, since it is larger than the sum of its proper divisors (1).

82505779 is an equidigital number, since it uses as much as digits as its factorization.

82505779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 82505779 is about 9083.2691802016. The cubic root of 82505779 is about 435.3395490426.

The spelling of 82505779 in words is "eighty-two million, five hundred five thousand, seven hundred seventy-nine".