2781651680 has 48 divisors (see below), whose sum is σ = 6917536080. Its totient is φ = 1054098432.

The previous prime is 2781651659. The next prime is 2781651709. The reversal of 2781651680 is 861561872.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454469 + ... + 460548.

It is an arithmetic number, because the mean of its divisors is an integer number (144115335).

Almost surely, 2^2781651680 is an apocalyptic number.

2781651680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2781651680 is an abundant number, since it is smaller than the sum of its proper divisors (4135884400).

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

2781651680 is a wasteful number, since it uses less digits than its factorization.

2781651680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915051 (or 915043 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 2781651680 is about 52741.3659284626. The cubic root of 2781651680 is about 1406.3742804268.

The spelling of 2781651680 in words is "two billion, seven hundred eighty-one million, six hundred fifty-one thousand, six hundred eighty".