2781740780 has 144 divisors (see below), whose sum is σ = 7396847136. Its totient is φ = 870912000.

The previous prime is 2781740777. The next prime is 2781740789. The reversal of 2781740780 is 870471872.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2781740789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1234655 + ... + 1236905.

It is an arithmetic number, because the mean of its divisors is an integer number (51366994).

Almost surely, 2^2781740780 is an apocalyptic number.

2781740780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2781740780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3698423568).

2781740780 is an abundant number, since it is smaller than the sum of its proper divisors (4615106356).

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

2781740780 is a wasteful number, since it uses less digits than its factorization.

2781740780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 44.

The square root of 2781740780 is about 52742.2106097194. The cubic root of 2781740780 is about 1406.3892962789.

The spelling of 2781740780 in words is "two billion, seven hundred eighty-one million, seven hundred forty thousand, seven hundred eighty".