2774721656 has 64 divisors (see below), whose sum is σ = 6214924800. Its totient is φ = 1135525248.

The previous prime is 2774721647. The next prime is 2774721689. The reversal of 2774721656 is 6561274772.

It is a self number, because there is not a number n which added to its sum of digits gives 2774721656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 942635 + ... + 945573.

It is an arithmetic number, because the mean of its divisors is an integer number (97108200).

Almost surely, 2^2774721656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2774721656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3107462400).

2774721656 is an abundant number, since it is smaller than the sum of its proper divisors (3440203144).

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

2774721656 is a wasteful number, since it uses less digits than its factorization.

2774721656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708 (or 3704 counting only the distinct ones).

The product of its digits is 987840, while the sum is 47.

The square root of 2774721656 is about 52675.6267736797. The cubic root of 2774721656 is about 1405.2053930719.

The spelling of 2774721656 in words is "two billion, seven hundred seventy-four million, seven hundred twenty-one thousand, six hundred fifty-six".