82528640489 has 4 divisors (see below), whose sum is σ = 84759144324. Its totient is φ = 80298136656.

The previous prime is 82528640459. The next prime is 82528640501. The reversal of 82528640489 is 98404682528.

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 49552986025 + 32975654464 = 222605^2 + 181592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82528640489 is a prime.

It is a super-2 number, since 2×82528640489² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82528640449) 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, 1115251862 + ... + 1115251935.

It is an arithmetic number, because the mean of its divisors is an integer number (21189786081).

Almost surely, 2^82528640489 is an apocalyptic number.

It is an amenable number.

82528640489 is a deficient number, since it is larger than the sum of its proper divisors (2230503835).

82528640489 is a wasteful number, since it uses less digits than its factorization.

82528640489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230503834.

The product of its (nonzero) digits is 8847360, while the sum is 56.

The spelling of 82528640489 in words is "eighty-two billion, five hundred twenty-eight million, six hundred forty thousand, four hundred eighty-nine".