82770785 has 16 divisors (see below), whose sum is σ = 103712400. Its totient is φ = 63334656.

The previous prime is 82770781. The next prime is 82770791. The reversal of 82770785 is 58707728.

It can be written as a sum of positive squares in 8 ways, for example, as 4695889 + 78074896 = 2167^2 + 8836^2 .

It is a cyclic number.

It is not a de Polignac number, because 82770785 - 2² = 82770781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82770781) 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 15 ways as a sum of consecutive naturals, for example, 13187 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (6482025).

Almost surely, 2^82770785 is an apocalyptic number.

It is an amenable number.

82770785 is a deficient number, since it is larger than the sum of its proper divisors (20941615).

82770785 is a wasteful number, since it uses less digits than its factorization.

82770785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380.

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 82770785 is about 9097.8450745218. The cubic root of 82770785 is about 435.8051499368.

The spelling of 82770785 in words is "eighty-two million, seven hundred seventy thousand, seven hundred eighty-five".