28347444641 has 2 divisors, whose sum is σ = 28347444642. Its totient is φ = 28347444640.

The previous prime is 28347444569. The next prime is 28347444673. The reversal of 28347444641 is 14644474382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26315328400 + 2032116241 = 162220^2 + 45079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28347444641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28347444241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14173722320 + 14173722321.

It is an arithmetic number, because the mean of its divisors is an integer number (14173722321).

Almost surely, 2^28347444641 is an apocalyptic number.

It is an amenable number.

28347444641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28347444641 is an equidigital number, since it uses as much as digits as its factorization.

28347444641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 47.

The spelling of 28347444641 in words is "twenty-eight billion, three hundred forty-seven million, four hundred forty-four thousand, six hundred forty-one".