2708786013921 has 99 divisors (see below), whose sum is σ = 4408209920217. Its totient is φ = 1663745728320.

The previous prime is 2708786013887. The next prime is 2708786013991. The reversal of 2708786013921 is 1293106878072.

It is a happy number.

The square root of 2708786013921 is 1645839.

It is a perfect power (a square), and thus also a powerful number.

2708786013921 is a `hidden beast` number, since 2 + 7 + 0 + 8 + 7 + 8 + 601 + 3 + 9 + 21 = 666.

2708786013921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 891239843025 + 1817546170896 = 944055^2 + 1348164^2 .

It is not a de Polignac number, because 2708786013921 - 2¹³ = 2708786005729 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2708786013991) by changing a digit.

It is a polite number, since it can be written in 98 ways as a sum of consecutive naturals, for example, 5199205141 + ... + 5199205661.

Almost surely, 2^{2708786013921} is an apocalyptic number.

2708786013921 is the 1645839-th square number.

2708786013921 is the 822920-th centered octagonal number.

It is an amenable number.

2708786013921 is a deficient number, since it is larger than the sum of its proper divisors (1699423906296).

2708786013921 is an frugal number, since it uses more digits than its factorization.

2708786013921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 2708786013921 in words is "two trillion, seven hundred eight billion, seven hundred eighty-six million, thirteen thousand, nine hundred twenty-one".