2543728061 has 4 divisors (see below), whose sum is σ = 2907117792. Its totient is φ = 2180338332.

The previous prime is 2543728051. The next prime is 2543728073. The reversal of 2543728061 is 1608273452.

It is a happy number.

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 not a de Polignac number, because 2543728061 - 2²² = 2539533757 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 (2543728051) 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, 181694855 + ... + 181694868.

It is an arithmetic number, because the mean of its divisors is an integer number (726779448).

Almost surely, 2^2543728061 is an apocalyptic number.

It is an amenable number.

2543728061 is a deficient number, since it is larger than the sum of its proper divisors (363389731).

2543728061 is an equidigital number, since it uses as much as digits as its factorization.

2543728061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363389730.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 2543728061 is about 50435.3850089399. The cubic root of 2543728061 is about 1365.0761962412.

The spelling of 2543728061 in words is "two billion, five hundred forty-three million, seven hundred twenty-eight thousand, sixty-one".