2771489728 has 56 divisors (see below), whose sum is σ = 6298744832. Its totient is φ = 1185249024.

The previous prime is 2771489717. The next prime is 2771489729. The reversal of 2771489728 is 8279841772.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2771489729) 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 7 ways as a sum of consecutive naturals, for example, 211825 + ... + 224527.

Almost surely, 2^2771489728 is an apocalyptic number.

2771489728 is a gapful number since it is divisible by the number (28) 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 2771489728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3149372416).

2771489728 is an abundant number, since it is smaller than the sum of its proper divisors (3527255104).

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

2771489728 is a wasteful number, since it uses less digits than its factorization.

2771489728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13209 (or 13199 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 55.

The square root of 2771489728 is about 52644.9401937166. The cubic root of 2771489728 is about 1404.6595981363.

The spelling of 2771489728 in words is "two billion, seven hundred seventy-one million, four hundred eighty-nine thousand, seven hundred twenty-eight".