82785649 has 2 divisors, whose sum is σ = 82785650. Its totient is φ = 82785648.

The previous prime is 82785643. The next prime is 82785697. The reversal of 82785649 is 94658728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72590400 + 10195249 = 8520^2 + 3193^2 .

It is a cyclic number.

It is not a de Polignac number, because 82785649 - 2⁹ = 82785137 is a prime.

It is not a weakly prime, because it can be changed into another prime (82785643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41392824 + 41392825.

It is an arithmetic number, because the mean of its divisors is an integer number (41392825).

Almost surely, 2^82785649 is an apocalyptic number.

It is an amenable number.

82785649 is a deficient number, since it is larger than the sum of its proper divisors (1).

82785649 is an equidigital number, since it uses as much as digits as its factorization.

82785649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 82785649 is about 9098.6619345924. The cubic root of 82785649 is about 435.8312357110.

The spelling of 82785649 in words is "eighty-two million, seven hundred eighty-five thousand, six hundred forty-nine".