28289801 has 2 divisors, whose sum is σ = 28289802. Its totient is φ = 28289800.

The previous prime is 28289783. The next prime is 28289813. The reversal of 28289801 is 10898282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 13697401 = 3820^2 + 3701^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289801 - 2²² = 24095497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28289831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144900 + 14144901.

It is an arithmetic number, because the mean of its divisors is an integer number (14144901).

Almost surely, 2^28289801 is an apocalyptic number.

It is an amenable number.

28289801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28289801 is an equidigital number, since it uses as much as digits as its factorization.

28289801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28289801 is about 5318.8157516500. The cubic root of 28289801 is about 304.7029303130.

The spelling of 28289801 in words is "twenty-eight million, two hundred eighty-nine thousand, eight hundred one".