2628728285 has 4 divisors (see below), whose sum is σ = 3154473948. Its totient is φ = 2102982624.

The previous prime is 2628728281. The next prime is 2628728339. The reversal of 2628728285 is 5828278262.

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 434180569 + 2194547716 = 20837^2 + 46846^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628728285 - 2² = 2628728281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2628728281) 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, 262872824 + ... + 262872833.

It is an arithmetic number, because the mean of its divisors is an integer number (788618487).

Almost surely, 2^2628728285 is an apocalyptic number.

It is an amenable number.

2628728285 is a deficient number, since it is larger than the sum of its proper divisors (525745663).

2628728285 is an equidigital number, since it uses as much as digits as its factorization.

2628728285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525745662.

The product of its digits is 1720320, while the sum is 50.

The square root of 2628728285 is about 51271.1252558397. The cubic root of 2628728285 is about 1380.1148621400.

The spelling of 2628728285 in words is "two billion, six hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred eighty-five".