2781016660 has 24 divisors (see below), whose sum is σ = 5848133256. Its totient is φ = 1110883200.

The previous prime is 2781016633. The next prime is 2781016661. The reversal of 2781016660 is 666101872.

It can be written as a sum of positive squares in 4 ways, for example, as 971194896 + 1809821764 = 31164^2 + 42542^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781016661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80191 + ... + 109510.

It is an arithmetic number, because the mean of its divisors is an integer number (243672219).

Almost surely, 2^2781016660 is an apocalyptic number.

2781016660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2781016660 is an abundant number, since it is smaller than the sum of its proper divisors (3067116596).

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

2781016660 is a wasteful number, since it uses less digits than its factorization.

2781016660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190443 (or 190441 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 2781016660 is about 52735.3454525520. The cubic root of 2781016660 is about 1406.2672524369.

The spelling of 2781016660 in words is "two billion, seven hundred eighty-one million, sixteen thousand, six hundred sixty".