82390689 has 20 divisors (see below), whose sum is σ = 126084420. Its totient is φ = 53585280.

The previous prime is 82390667. The next prime is 82390717. The reversal of 82390689 is 98609328.

It can be written as a sum of positive squares in 2 ways, for example, as 35605089 + 46785600 = 5967^2 + 6840^2 .

It is not a de Polignac number, because 82390689 - 2⁸ = 82390433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82391689) 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 in 19 ways as a sum of consecutive naturals, for example, 9084 + ... + 15725.

It is an arithmetic number, because the mean of its divisors is an integer number (6304221).

Almost surely, 2^82390689 is an apocalyptic number.

It is an amenable number.

82390689 is a deficient number, since it is larger than the sum of its proper divisors (43693731).

82390689 is a wasteful number, since it uses less digits than its factorization.

82390689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24862 (or 24853 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 82390689 is about 9076.9316952371. The cubic root of 82390689 is about 435.1370317392.

The spelling of 82390689 in words is "eighty-two million, three hundred ninety thousand, six hundred eighty-nine".