2778481720 has 128 divisors (see below), whose sum is σ = 7596633600. Its totient is φ = 893376000.

The previous prime is 2778481687. The next prime is 2778481721. The reversal of 2778481720 is 271848772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778481721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 534735 + ... + 539905.

It is an arithmetic number, because the mean of its divisors is an integer number (59348700).

Almost surely, 2^2778481720 is an apocalyptic number.

2778481720 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 2778481720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3798316800).

2778481720 is an abundant number, since it is smaller than the sum of its proper divisors (4818151880).

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

2778481720 is a wasteful number, since it uses less digits than its factorization.

2778481720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309 (or 5305 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 46.

The square root of 2778481720 is about 52711.3054287218. The cubic root of 2778481720 is about 1405.8398443798.

The spelling of 2778481720 in words is "two billion, seven hundred seventy-eight million, four hundred eighty-one thousand, seven hundred twenty".