2740078921 has 16 divisors (see below), whose sum is σ = 2919142800. Its totient is φ = 2563061760.

The previous prime is 2740078909. The next prime is 2740078927. The reversal of 2740078921 is 1298700472.

It can be written as a sum of positive squares in 8 ways, for example, as 108388921 + 2631690000 = 10411^2 + 51300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2740078921 - 2²¹ = 2737981769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2740078927) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2497245 + ... + 2498341.

It is an arithmetic number, because the mean of its divisors is an integer number (182446425).

Almost surely, 2^2740078921 is an apocalyptic number.

It is an amenable number.

2740078921 is a deficient number, since it is larger than the sum of its proper divisors (179063879).

2740078921 is a wasteful number, since it uses less digits than its factorization.

2740078921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2740078921 is about 52345.7631618835. The cubic root of 2740078921 is about 1399.3328319424.

The spelling of 2740078921 in words is "two billion, seven hundred forty million, seventy-eight thousand, nine hundred twenty-one".