2728292921 has 4 divisors (see below), whose sum is σ = 2731545600. Its totient is φ = 2725040244.

The previous prime is 2728292909. The next prime is 2728292929. The reversal of 2728292921 is 1292928272.

2728292921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2728292921 - 2¹⁰ = 2728291897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2728292929) 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, 1625081 + ... + 1626758.

It is an arithmetic number, because the mean of its divisors is an integer number (682886400).

Almost surely, 2^2728292921 is an apocalyptic number.

It is an amenable number.

2728292921 is a deficient number, since it is larger than the sum of its proper divisors (3252679).

2728292921 is an equidigital number, since it uses as much as digits as its factorization.

2728292921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252678.

The product of its digits is 145152, while the sum is 44.

The square root of 2728292921 is about 52233.0634847316. The cubic root of 2728292921 is about 1397.3236148663.

The spelling of 2728292921 in words is "two billion, seven hundred twenty-eight million, two hundred ninety-two thousand, nine hundred twenty-one".