2728678504421 has 4 divisors (see below), whose sum is σ = 2728748647872. Its totient is φ = 2728608360972.

The previous prime is 2728678504393. The next prime is 2728678504469. The reversal of 2728678504421 is 1244058768272.

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 2728678504421 - 2¹⁴ = 2728678488037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2728678504621) 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, 35013341 + ... + 35091186.

It is an arithmetic number, because the mean of its divisors is an integer number (682187161968).

Almost surely, 2^{2728678504421} is an apocalyptic number.

It is an amenable number.

2728678504421 is a deficient number, since it is larger than the sum of its proper divisors (70143451).

2728678504421 is an equidigital number, since it uses as much as digits as its factorization.

2728678504421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70143450.

The product of its (nonzero) digits is 12042240, while the sum is 56.

The spelling of 2728678504421 in words is "two trillion, seven hundred twenty-eight billion, six hundred seventy-eight million, five hundred four thousand, four hundred twenty-one".