28289019 has 16 divisors (see below), whose sum is σ = 42476544. Its totient is φ = 16591200.

The previous prime is 28289017. The next prime is 28289021. The reversal of 28289019 is 91098282.

It is an interprime number because it is at equal distance from previous prime (28289017) and next prime (28289021).

It is not a de Polignac number, because 28289019 - 2¹ = 28289017 is a prime.

It is a super-2 number, since 2×28289019² = 1600537191964722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28289017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12804 + ... + 14849.

It is an arithmetic number, because the mean of its divisors is an integer number (2654784).

Almost surely, 2^28289019 is an apocalyptic number.

28289019 is a deficient number, since it is larger than the sum of its proper divisors (14187525).

28289019 is a wasteful number, since it uses less digits than its factorization.

28289019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27698.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 28289019 is about 5318.7422385372. The cubic root of 28289019 is about 304.7001227065.

The spelling of 28289019 in words is "twenty-eight million, two hundred eighty-nine thousand, nineteen".