28744316641 has 4 divisors (see below), whose sum is σ = 29286662292. Its totient is φ = 28201970992.

The previous prime is 28744316633. The next prime is 28744316647. The reversal of 28744316641 is 14661344782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13437678241 + 15306638400 = 115921^2 + 123720^2 .

It is a cyclic number.

It is not a de Polignac number, because 28744316641 - 2³ = 28744316633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28744316591 and 28744316600.

It is not an unprimeable number, because it can be changed into a prime (28744316647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271172746 + ... + 271172851.

It is an arithmetic number, because the mean of its divisors is an integer number (7321665573).

Almost surely, 2^28744316641 is an apocalyptic number.

It is an amenable number.

28744316641 is a deficient number, since it is larger than the sum of its proper divisors (542345651).

28744316641 is an equidigital number, since it uses as much as digits as its factorization.

28744316641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542345650.

The product of its digits is 774144, while the sum is 46.

The spelling of 28744316641 in words is "twenty-eight billion, seven hundred forty-four million, three hundred sixteen thousand, six hundred forty-one".