82128712 has 8 divisors (see below), whose sum is σ = 153991350. Its totient is φ = 41064352.

The previous prime is 82128707. The next prime is 82128727. The reversal of 82128712 is 21782128.

It can be written as a sum of positive squares in only one way, i.e., 62821476 + 19307236 = 7926^2 + 4394^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5133037 + ... + 5133052.

Almost surely, 2^82128712 is an apocalyptic number.

It is an amenable number.

82128712 is a deficient number, since it is larger than the sum of its proper divisors (71862638).

82128712 is a wasteful number, since it uses less digits than its factorization.

82128712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10266095 (or 10266091 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 82128712 is about 9062.4892827523. The cubic root of 82128712 is about 434.6753414949.

The spelling of 82128712 in words is "eighty-two million, one hundred twenty-eight thousand, seven hundred twelve".