28043801 has 2 divisors, whose sum is σ = 28043802. Its totient is φ = 28043800.

The previous prime is 28043789. The next prime is 28043839. The reversal of 28043801 is 10834082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23425600 + 4618201 = 4840^2 + 2149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28043801 is a prime.

It is a super-4 number, since 4×28043801⁴ (a number of 31 digits) contains 4444 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28043881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14021900 + 14021901.

It is an arithmetic number, because the mean of its divisors is an integer number (14021901).

Almost surely, 2^28043801 is an apocalyptic number.

It is an amenable number.

28043801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28043801 is an equidigital number, since it uses as much as digits as its factorization.

28043801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28043801 is about 5295.6398102590. The cubic root of 28043801 is about 303.8171547343.

Adding to 28043801 its reverse (10834082), we get a palindrome (38877883).

The spelling of 28043801 in words is "twenty-eight million, forty-three thousand, eight hundred one".