82785389 has 4 divisors (see below), whose sum is σ = 82803900. Its totient is φ = 82766880.

The previous prime is 82785383. The next prime is 82785403. The reversal of 82785389 is 98358728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10824100 + 71961289 = 3290^2 + 8483^2 .

It is a cyclic number.

It is not a de Polignac number, because 82785389 - 2¹⁶ = 82719853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82785383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087 + ... + 13035.

It is an arithmetic number, because the mean of its divisors is an integer number (20700975).

Almost surely, 2^82785389 is an apocalyptic number.

It is an amenable number.

82785389 is a deficient number, since it is larger than the sum of its proper divisors (18511).

82785389 is a wasteful number, since it uses less digits than its factorization.

82785389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18510.

The product of its digits is 967680, while the sum is 50.

The square root of 82785389 is about 9098.6476467660. The cubic root of 82785389 is about 435.8307794474.

The spelling of 82785389 in words is "eighty-two million, seven hundred eighty-five thousand, three hundred eighty-nine".