82860509 has 4 divisors (see below), whose sum is σ = 84218940. Its totient is φ = 81502080.

The previous prime is 82860487. The next prime is 82860521. The reversal of 82860509 is 90506828.

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 40896025 + 41964484 = 6395^2 + 6478^2 .

It is a cyclic number.

It is not a de Polignac number, because 82860509 - 2¹⁶ = 82794973 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 (82860529) 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, 679124 + ... + 679245.

It is an arithmetic number, because the mean of its divisors is an integer number (21054735).

Almost surely, 2^82860509 is an apocalyptic number.

It is an amenable number.

82860509 is a deficient number, since it is larger than the sum of its proper divisors (1358431).

82860509 is a wasteful number, since it uses less digits than its factorization.

82860509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358430.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 82860509 is about 9102.7747967309. The cubic root of 82860509 is about 435.9625648217.

The spelling of 82860509 in words is "eighty-two million, eight hundred sixty thousand, five hundred nine".