2628778261 has 8 divisors (see below), whose sum is σ = 2743594560. Its totient is φ = 2514005472.

The previous prime is 2628778219. The next prime is 2628778343. The reversal of 2628778261 is 1628778262.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2628778261 - 2¹³ = 2628770069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2628758261) 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 7 ways as a sum of consecutive naturals, for example, 198825 + ... + 211633.

It is an arithmetic number, because the mean of its divisors is an integer number (342949320).

Almost surely, 2^2628778261 is an apocalyptic number.

It is an amenable number.

2628778261 is a deficient number, since it is larger than the sum of its proper divisors (114816299).

2628778261 is a wasteful number, since it uses less digits than its factorization.

2628778261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21755.

The product of its digits is 903168, while the sum is 49.

The square root of 2628778261 is about 51271.6126233611. The cubic root of 2628778261 is about 1380.1236080906.

Subtracting from 2628778261 its reverse (1628778262), we obtain a palindrome (999999999).

The spelling of 2628778261 in words is "two billion, six hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred sixty-one".