82816509 has 8 divisors (see below), whose sum is σ = 110465280. Its totient is φ = 55189376.

The previous prime is 82816483. The next prime is 82816511. The reversal of 82816509 is 90561828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82816509 - 2⁵ = 82816477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82816519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9037 + ... + 15725.

It is an arithmetic number, because the mean of its divisors is an integer number (13808160).

Almost surely, 2^82816509 is an apocalyptic number.

It is an amenable number.

82816509 is a deficient number, since it is larger than the sum of its proper divisors (27648771).

82816509 is a wasteful number, since it uses less digits than its factorization.

82816509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10819.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 82816509 is about 9100.3576303352. The cubic root of 82816509 is about 435.8853839087.

The spelling of 82816509 in words is "eighty-two million, eight hundred sixteen thousand, five hundred nine".