28450019 has 4 divisors (see below), whose sum is σ = 30638496. Its totient is φ = 26261544.

The previous prime is 28450001. The next prime is 28450031. The reversal of 28450019 is 91005482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91005482 = 2 ⋅45502741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28450019 is a prime.

It is a super-2 number, since 2×28450019² = 1618807162200722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28449973 and 28450000.

It is not an unprimeable number, because it can be changed into a prime (28450069) 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, 1094219 + ... + 1094244.

It is an arithmetic number, because the mean of its divisors is an integer number (7659624).

Almost surely, 2^28450019 is an apocalyptic number.

28450019 is a deficient number, since it is larger than the sum of its proper divisors (2188477).

28450019 is a wasteful number, since it uses less digits than its factorization.

28450019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188476.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28450019 is about 5333.8559223136. The cubic root of 28450019 is about 305.2770715235.

The spelling of 28450019 in words is "twenty-eight million, four hundred fifty thousand, nineteen".