28350081 has 36 divisors (see below), whose sum is σ = 44284500. Its totient is φ = 18125856.

The previous prime is 28350079. The next prime is 28350097. The reversal of 28350081 is 18005382.

It is a happy number.

28350081 is a `hidden beast` number, since 2 + 83 + 500 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8503056 + 19847025 = 2916^2 + 4455^2 .

It is not a de Polignac number, because 28350081 - 2¹ = 28350079 is a prime.

It is a super-2 number, since 2×28350081² = 1607454185413122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28352081) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 190195 + ... + 190343.

It is an arithmetic number, because the mean of its divisors is an integer number (1230125).

Almost surely, 2^28350081 is an apocalyptic number.

It is an amenable number.

28350081 is a deficient number, since it is larger than the sum of its proper divisors (15934419).

28350081 is an frugal number, since it uses more digits than its factorization.

28350081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28350081 is about 5324.4794111725. The cubic root of 28350081 is about 304.9191974431.

The spelling of 28350081 in words is "twenty-eight million, three hundred fifty thousand, eighty-one".