28143641 has 2 divisors, whose sum is σ = 28143642. Its totient is φ = 28143640.

The previous prime is 28143613. The next prime is 28143679. The reversal of 28143641 is 14634182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 633616 = 5245^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 28143641 - 2²² = 23949337 is a prime.

It is not a weakly prime, because it can be changed into another prime (28140641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071820 + 14071821.

It is an arithmetic number, because the mean of its divisors is an integer number (14071821).

Almost surely, 2^28143641 is an apocalyptic number.

It is an amenable number.

28143641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28143641 is an equidigital number, since it uses as much as digits as its factorization.

28143641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 28143641 is about 5305.0580581177. The cubic root of 28143641 is about 304.1772720974.

The spelling of 28143641 in words is "twenty-eight million, one hundred forty-three thousand, six hundred forty-one".