28381569 has 8 divisors (see below), whose sum is σ = 37869792. Its totient is φ = 18907200.

The previous prime is 28381567. The next prime is 28381571. The reversal of 28381569 is 96518382.

It is an interprime number because it is at equal distance from previous prime (28381567) and next prime (28381571).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28381569 - 2¹ = 28381567 is a prime.

It is a super-2 number, since 2×28381569² = 1611026917803522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28381569.

It is not an unprimeable number, because it can be changed into a prime (28381567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3094 + ... + 8144.

It is an arithmetic number, because the mean of its divisors is an integer number (4733724).

Almost surely, 2^28381569 is an apocalyptic number.

It is an amenable number.

28381569 is a deficient number, since it is larger than the sum of its proper divisors (9488223).

28381569 is a wasteful number, since it uses less digits than its factorization.

28381569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6927.

The product of its digits is 103680, while the sum is 42.

The square root of 28381569 is about 5327.4354993749. The cubic root of 28381569 is about 305.0320453654.

The spelling of 28381569 in words is "twenty-eight million, three hundred eighty-one thousand, five hundred sixty-nine".