28426449 has 4 divisors (see below), whose sum is σ = 37901936. Its totient is φ = 18950964.

The previous prime is 28426441. The next prime is 28426477. The reversal of 28426449 is 94462482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28426449 - 2³ = 28426441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28426441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4737739 + ... + 4737744.

It is an arithmetic number, because the mean of its divisors is an integer number (9475484).

Almost surely, 2^28426449 is an apocalyptic number.

It is an amenable number.

28426449 is a deficient number, since it is larger than the sum of its proper divisors (9475487).

28426449 is an equidigital number, since it uses as much as digits as its factorization.

28426449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9475486.

The product of its digits is 110592, while the sum is 39.

The square root of 28426449 is about 5331.6459934996. The cubic root of 28426449 is about 305.1927438875.

The spelling of 28426449 in words is "twenty-eight million, four hundred twenty-six thousand, four hundred forty-nine".