28445441 has 4 divisors (see below), whose sum is σ = 28636500. Its totient is φ = 28254384.

The previous prime is 28445429. The next prime is 28445449. The reversal of 28445441 is 14454482.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6355441 + 22090000 = 2521^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 28445441 - 2²² = 24251137 is a prime.

It is a super-2 number, since 2×28445441² = 1618286227368962, 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 = 28445398 and 28445407.

It is not an unprimeable number, because it can be changed into a prime (28445449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95306 + ... + 95603.

It is an arithmetic number, because the mean of its divisors is an integer number (7159125).

Almost surely, 2^28445441 is an apocalyptic number.

It is an amenable number.

28445441 is a deficient number, since it is larger than the sum of its proper divisors (191059).

28445441 is a wasteful number, since it uses less digits than its factorization.

28445441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191058.

The product of its digits is 20480, while the sum is 32.

The square root of 28445441 is about 5333.4267595984. The cubic root of 28445441 is about 305.2606962164.

The spelling of 28445441 in words is "twenty-eight million, four hundred forty-five thousand, four hundred forty-one".