2781228815064 has 96 divisors (see below), whose sum is σ = 8986963892400. Its totient is φ = 794636801280.

The previous prime is 2781228815039. The next prime is 2781228815089. The reversal of 2781228815064 is 4605188221872.

2781228815064 is a `hidden beast` number, since 2 + 7 + 8 + 122 + 8 + 8 + 1 + 506 + 4 = 666.

2781228815064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2781228815039) and next prime (2781228815089).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2781228815064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131377777 + ... + 131398944.

Almost surely, 2^{2781228815064} is an apocalyptic number.

2781228815064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2781228815064 is an abundant number, since it is smaller than the sum of its proper divisors (6205735077336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781228815064 is a wasteful number, since it uses less digits than its factorization.

2781228815064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262776750 (or 262776733 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 2781228815064 in words is "two trillion, seven hundred eighty-one billion, two hundred twenty-eight million, eight hundred fifteen thousand, sixty-four".