28418861 has 2 divisors, whose sum is σ = 28418862. Its totient is φ = 28418860.

The previous prime is 28418837. The next prime is 28418867. The reversal of 28418861 is 16881482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28153636 + 265225 = 5306^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 28418861 - 2¹⁸ = 28156717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28418867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14209430 + 14209431.

It is an arithmetic number, because the mean of its divisors is an integer number (14209431).

Almost surely, 2^28418861 is an apocalyptic number.

It is an amenable number.

28418861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28418861 is an equidigital number, since it uses as much as digits as its factorization.

28418861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 38.

The square root of 28418861 is about 5330.9343458722. The cubic root of 28418861 is about 305.1655859799.

The spelling of 28418861 in words is "twenty-eight million, four hundred eighteen thousand, eight hundred sixty-one".