28861201 has 2 divisors, whose sum is σ = 28861202. Its totient is φ = 28861200.

The previous prime is 28861199. The next prime is 28861211. The reversal of 28861201 is 10216882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24760576 + 4100625 = 4976^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 28861201 - 2¹ = 28861199 is a prime.

Together with 28861199, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28861201.

It is not a weakly prime, because it can be changed into another prime (28861211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14430600 + 14430601.

It is an arithmetic number, because the mean of its divisors is an integer number (14430601).

Almost surely, 2^28861201 is an apocalyptic number.

It is an amenable number.

28861201 is a deficient number, since it is larger than the sum of its proper divisors (1).

28861201 is an equidigital number, since it uses as much as digits as its factorization.

28861201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28861201 is about 5372.2621864537. The cubic root of 28861201 is about 306.7407438932.

The spelling of 28861201 in words is "twenty-eight million, eight hundred sixty-one thousand, two hundred one".