12764528639 has 4 divisors (see below), whose sum is σ = 13005368856. Its totient is φ = 12523688424.

The previous prime is 12764528627. The next prime is 12764528671. The reversal of 12764528639 is 93682546721.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-12764528639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 240840163 = 12764528639 / (1 + 2 + 7 + 6 + 4 + 5 + 2 + 8 + 6 + 3 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12764525639) 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, 120420029 + ... + 120420134.

It is an arithmetic number, because the mean of its divisors is an integer number (3251342214).

Almost surely, 2^12764528639 is an apocalyptic number.

12764528639 is a deficient number, since it is larger than the sum of its proper divisors (240840217).

12764528639 is an equidigital number, since it uses as much as digits as its factorization.

12764528639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240840216.

The product of its digits is 4354560, while the sum is 53.

The spelling of 12764528639 in words is "twelve billion, seven hundred sixty-four million, five hundred twenty-eight thousand, six hundred thirty-nine".