2720639924 has 12 divisors (see below), whose sum is σ = 4766554884. Its totient is φ = 1358767104.

The previous prime is 2720639923. The next prime is 2720639941. The reversal of 2720639924 is 4299360272.

It can be written as a sum of positive squares in 2 ways, for example, as 1037999524 + 1682640400 = 32218^2 + 41020^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720639923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384269 + ... + 391284.

It is an arithmetic number, because the mean of its divisors is an integer number (397212907).

Almost surely, 2^2720639924 is an apocalyptic number.

It is an amenable number.

2720639924 is a deficient number, since it is larger than the sum of its proper divisors (2045914960).

2720639924 is a wasteful number, since it uses less digits than its factorization.

2720639924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776434 (or 776432 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 2720639924 is about 52159.7538721187. The cubic root of 2720639924 is about 1396.0158706526.

The spelling of 2720639924 in words is "two billion, seven hundred twenty million, six hundred thirty-nine thousand, nine hundred twenty-four".