28201813 has 2 divisors, whose sum is σ = 28201814. Its totient is φ = 28201812.

The previous prime is 28201787. The next prime is 28201819. The reversal of 28201813 is 31810282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26193924 + 2007889 = 5118^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 28201813 - 2⁵ = 28201781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28201819) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14100906 + 14100907.

It is an arithmetic number, because the mean of its divisors is an integer number (14100907).

Almost surely, 2^28201813 is an apocalyptic number.

It is an amenable number.

28201813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28201813 is an equidigital number, since it uses as much as digits as its factorization.

28201813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28201813 is about 5310.5379200228. The cubic root of 28201813 is about 304.3867027448.

The spelling of 28201813 in words is "twenty-eight million, two hundred one thousand, eight hundred thirteen".