82128520 has 16 divisors (see below), whose sum is σ = 184789260. Its totient is φ = 32851392.

The previous prime is 82128511. The next prime is 82128521. The reversal of 82128520 is 2582128.

It can be written as a sum of positive squares in 2 ways, for example, as 80174116 + 1954404 = 8954^2 + 1398^2 .

It is not an unprimeable number, because it can be changed into a prime (82128521) 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, 1026567 + ... + 1026646.

Almost surely, 2^82128520 is an apocalyptic number.

It is an amenable number.

82128520 is an abundant number, since it is smaller than the sum of its proper divisors (102660740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82128520 is a wasteful number, since it uses less digits than its factorization.

82128520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053224 (or 2053220 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 82128520 is about 9062.4786896301. The cubic root of 82128520 is about 434.6750027675.

The spelling of 82128520 in words is "eighty-two million, one hundred twenty-eight thousand, five hundred twenty".