12764809 has 4 divisors (see below), whose sum is σ = 12780180. Its totient is φ = 12749440.

The previous prime is 12764797. The next prime is 12764831. The reversal of 12764809 is 90846721.

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 2039184 + 10725625 = 1428^2 + 3275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12764809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12764849) 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, 6364 + ... + 8125.

It is an arithmetic number, because the mean of its divisors is an integer number (3195045).

Almost surely, 2^12764809 is an apocalyptic number.

It is an amenable number.

12764809 is a deficient number, since it is larger than the sum of its proper divisors (15371).

12764809 is an equidigital number, since it uses as much as digits as its factorization.

12764809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15370.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 12764809 is about 3572.7872872591. The cubic root of 12764809 is about 233.7068491558.

The spelling of 12764809 in words is "twelve million, seven hundred sixty-four thousand, eight hundred nine".