28190449 has 16 divisors (see below), whose sum is σ = 32853888. Its totient is φ = 23692032.

The previous prime is 28190443. The next prime is 28190453. The reversal of 28190449 is 94409182.

It is a happy number.

It is not a de Polignac number, because 28190449 - 2¹⁷ = 28059377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28190443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124074 + ... + 124300.

It is an arithmetic number, because the mean of its divisors is an integer number (2053368).

Almost surely, 2^28190449 is an apocalyptic number.

It is an amenable number.

28190449 is a deficient number, since it is larger than the sum of its proper divisors (4663439).

28190449 is a wasteful number, since it uses less digits than its factorization.

28190449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28190449 is about 5309.4678641084. The cubic root of 28190449 is about 304.3458127589.

The spelling of 28190449 in words is "twenty-eight million, one hundred ninety thousand, four hundred forty-nine".