28143331 has 2 divisors, whose sum is σ = 28143332. Its totient is φ = 28143330.

The previous prime is 28143317. The next prime is 28143373. The reversal of 28143331 is 13334182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28143331 - 2¹⁹ = 27619043 is a prime.

It is a super-2 number, since 2×28143331² = 1584094159551122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28143296 and 28143305.

It is not a weakly prime, because it can be changed into another prime (28143131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14071665 + 14071666.

It is an arithmetic number, because the mean of its divisors is an integer number (14071666).

Almost surely, 2^28143331 is an apocalyptic number.

28143331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28143331 is an equidigital number, since it uses as much as digits as its factorization.

28143331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 28143331 is about 5305.0288406379. The cubic root of 28143331 is about 304.1761552637.

The spelling of 28143331 in words is "twenty-eight million, one hundred forty-three thousand, three hundred thirty-one".