2781740778 has 32 divisors (see below), whose sum is σ = 5814014976. Its totient is φ = 886409328.

The previous prime is 2781740777. The next prime is 2781740789. The reversal of 2781740778 is 8770471872.

It is a self number, because there is not a number n which added to its sum of digits gives 2781740778.

It is not an unprimeable number, because it can be changed into a prime (2781740777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102576 + ... + 126827.

It is an arithmetic number, because the mean of its divisors is an integer number (181687968).

Almost surely, 2^2781740778 is an apocalyptic number.

2781740778 is an abundant number, since it is smaller than the sum of its proper divisors (3032274198).

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

2781740778 is a wasteful number, since it uses less digits than its factorization.

2781740778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229498.

The product of its (nonzero) digits is 1229312, while the sum is 51.

The square root of 2781740778 is about 52742.2105907593. The cubic root of 2781740778 is about 1406.3892959418.

The spelling of 2781740778 in words is "two billion, seven hundred eighty-one million, seven hundred forty thousand, seven hundred seventy-eight".