82809512 has 16 divisors (see below), whose sum is σ = 155875860. Its totient is φ = 41242624.

The previous prime is 82809511. The next prime is 82809523. The reversal of 82809512 is 21590828.

It can be written as a sum of positive squares in 2 ways, for example, as 56942116 + 25867396 = 7546^2 + 5086^2 .

It is not an unprimeable number, because it can be changed into a prime (82809511) 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, 18083 + ... + 22194.

Almost surely, 2^82809512 is an apocalyptic number.

It is an amenable number.

82809512 is a deficient number, since it is larger than the sum of its proper divisors (73066348).

82809512 is a wasteful number, since it uses less digits than its factorization.

82809512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40540 (or 40536 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 82809512 is about 9099.9731867737. The cubic root of 82809512 is about 435.8731078703.

The spelling of 82809512 in words is "eighty-two million, eight hundred nine thousand, five hundred twelve".