28618019 has 4 divisors (see below), whose sum is σ = 28645296. Its totient is φ = 28590744.

The previous prime is 28618013. The next prime is 28618033. The reversal of 28618019 is 91081682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28618019 - 2⁸ = 28617763 is a prime.

It is a super-2 number, since 2×28618019² = 1637982022968722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28618019.

It is not an unprimeable number, because it can be changed into a prime (28618013) 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 in 3 ways as a sum of consecutive naturals, for example, 11999 + ... + 14184.

It is an arithmetic number, because the mean of its divisors is an integer number (7161324).

Almost surely, 2^28618019 is an apocalyptic number.

28618019 is a deficient number, since it is larger than the sum of its proper divisors (27277).

28618019 is a wasteful number, since it uses less digits than its factorization.

28618019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27276.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 28618019 is about 5349.5811985612. The cubic root of 28618019 is about 305.8767890761.

The spelling of 28618019 in words is "twenty-eight million, six hundred eighteen thousand, nineteen".