2749570821 has 12 divisors (see below), whose sum is σ = 3972810348. Its totient is φ = 1832489664.

The previous prime is 2749570763. The next prime is 2749570841. The reversal of 2749570821 is 1280759472.

It is a happy number.

2749570821 is a `hidden beast` number, since 2 + 74 + 9 + 570 + 8 + 2 + 1 = 666.

2749570821 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 2 ways, for example, as 1921857921 + 827712900 = 43839^2 + 28770^2 .

It is not a de Polignac number, because 2749570821 - 2⁹ = 2749570309 is a prime.

It is a super-2 number, since 2×2749570821² = 15120279399389228082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2749570841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14040 + ... + 75473.

It is an arithmetic number, because the mean of its divisors is an integer number (331067529).

Almost surely, 2^2749570821 is an apocalyptic number.

It is an amenable number.

2749570821 is a deficient number, since it is larger than the sum of its proper divisors (1223239527).

2749570821 is a wasteful number, since it uses less digits than its factorization.

2749570821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92932 (or 92929 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 2749570821 is about 52436.3501876322. The cubic root of 2749570821 is about 1400.9467781154.

The spelling of 2749570821 in words is "two billion, seven hundred forty-nine million, five hundred seventy thousand, eight hundred twenty-one".