28038999641 has 2 divisors, whose sum is σ = 28038999642. Its totient is φ = 28038999640.

The previous prime is 28038999631. The next prime is 28038999649. The reversal of 28038999641 is 14699983082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25020596041 + 3018403600 = 158179^2 + 54940^2 .

It is a cyclic number.

It is not a de Polignac number, because 28038999641 - 2¹⁴ = 28038983257 is a prime.

It is not a weakly prime, because it can be changed into another prime (28038999649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14019499820 + 14019499821.

It is an arithmetic number, because the mean of its divisors is an integer number (14019499821).

Almost surely, 2^28038999641 is an apocalyptic number.

It is an amenable number.

28038999641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28038999641 is an equidigital number, since it uses as much as digits as its factorization.

28038999641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 28038999641 in words is "twenty-eight billion, thirty-eight million, nine hundred ninety-nine thousand, six hundred forty-one".