2564728813 has 4 divisors (see below), whose sum is σ = 2699714560. Its totient is φ = 2429743068.

The previous prime is 2564728807. The next prime is 2564728841. The reversal of 2564728813 is 3188274652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564728813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564728513) 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, 67492845 + ... + 67492882.

It is an arithmetic number, because the mean of its divisors is an integer number (674928640).

Almost surely, 2^2564728813 is an apocalyptic number.

It is an amenable number.

2564728813 is a deficient number, since it is larger than the sum of its proper divisors (134985747).

2564728813 is a wasteful number, since it uses less digits than its factorization.

2564728813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134985746.

The product of its digits is 645120, while the sum is 46.

The square root of 2564728813 is about 50643.1516890487. The cubic root of 2564728813 is about 1368.8225472053.

The spelling of 2564728813 in words is "two billion, five hundred sixty-four million, seven hundred twenty-eight thousand, eight hundred thirteen".