2721655840 has 96 divisors (see below), whose sum is σ = 6572664000. Its totient is φ = 1064690688.

The previous prime is 2721655831. The next prime is 2721655877. The reversal of 2721655840 is 485561272.

It is a super-2 number, since 2×2721655840² = 14814821022812211200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2721655793 and 2721655802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2161131 + ... + 2162389.

It is an arithmetic number, because the mean of its divisors is an integer number (68465250).

Almost surely, 2^2721655840 is an apocalyptic number.

2721655840 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 2721655840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3286332000).

2721655840 is an abundant number, since it is smaller than the sum of its proper divisors (3851008160).

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

2721655840 is a wasteful number, since it uses less digits than its factorization.

2721655840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 2721655840 is about 52169.4914677151. The cubic root of 2721655840 is about 1396.1896114400.

The spelling of 2721655840 in words is "two billion, seven hundred twenty-one million, six hundred fifty-five thousand, eight hundred forty".