2578872557 has 4 divisors (see below), whose sum is σ = 2579521116. Its totient is φ = 2578224000.

The previous prime is 2578872521. The next prime is 2578872581. The reversal of 2578872557 is 7552788752.

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 950427241 + 1628445316 = 30829^2 + 40354^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578872557 - 2⁸ = 2578872301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578872587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318278 + ... + 326279.

It is an arithmetic number, because the mean of its divisors is an integer number (644880279).

Almost surely, 2^2578872557 is an apocalyptic number.

It is an amenable number.

2578872557 is a deficient number, since it is larger than the sum of its proper divisors (648559).

2578872557 is an equidigital number, since it uses as much as digits as its factorization.

2578872557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648558.

The product of its digits is 10976000, while the sum is 56.

The square root of 2578872557 is about 50782.6009278769. The cubic root of 2578872557 is about 1371.3341571965.

The spelling of 2578872557 in words is "two billion, five hundred seventy-eight million, eight hundred seventy-two thousand, five hundred fifty-seven".