28013943641 has 2 divisors, whose sum is σ = 28013943642. Its totient is φ = 28013943640.

The previous prime is 28013943637. The next prime is 28013943647. The reversal of 28013943641 is 14634931082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20219702416 + 7794241225 = 142196^2 + 88285^2 .

It is a cyclic number.

It is not a de Polignac number, because 28013943641 - 2² = 28013943637 is a prime.

It is a super-2 number, since 2×28013943641² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28013943647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006971820 + 14006971821.

It is an arithmetic number, because the mean of its divisors is an integer number (14006971821).

Almost surely, 2^28013943641 is an apocalyptic number.

It is an amenable number.

28013943641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28013943641 is an equidigital number, since it uses as much as digits as its factorization.

28013943641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 28013943641 in words is "twenty-eight billion, thirteen million, nine hundred forty-three thousand, six hundred forty-one".