2721667680 has 144 divisors (see below), whose sum is σ = 9309160224. Its totient is φ = 724101120.

The previous prime is 2721667667. The next prime is 2721667693. The reversal of 2721667680 is 867661272.

It is an interprime number because it is at equal distance from previous prime (2721667667) and next prime (2721667693).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 699340 + ... + 703220.

It is an arithmetic number, because the mean of its divisors is an integer number (64646946).

Almost surely, 2^2721667680 is an apocalyptic number.

2721667680 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 2721667680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4654580112).

2721667680 is an abundant number, since it is smaller than the sum of its proper divisors (6587492544).

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

2721667680 is a wasteful number, since it uses less digits than its factorization.

2721667680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4378 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 2721667680 is about 52169.6049438751. The cubic root of 2721667680 is about 1396.1916360483.

The spelling of 2721667680 in words is "two billion, seven hundred twenty-one million, six hundred sixty-seven thousand, six hundred eighty".