28053889 has 6 divisors (see below), whose sum is σ = 28238210. Its totient is φ = 27870720.

The previous prime is 28053887. The next prime is 28053913. The reversal of 28053889 is 98835082.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 5253264 = 4775^2 + 2292^2 .

It is not a de Polignac number, because 28053889 - 2¹ = 28053887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28053887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36097 + ... + 36865.

Almost surely, 2^28053889 is an apocalyptic number.

It is an amenable number.

28053889 is a deficient number, since it is larger than the sum of its proper divisors (184321).

28053889 is an frugal number, since it uses more digits than its factorization.

28053889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 28053889 is about 5296.5922063153. The cubic root of 28053889 is about 303.8535803722.

The spelling of 28053889 in words is "twenty-eight million, fifty-three thousand, eight hundred eighty-nine".