28421444 has 6 divisors (see below), whose sum is σ = 49737534. Its totient is φ = 14210720.

The previous prime is 28421443. The next prime is 28421531. The reversal of 28421444 is 44412482.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 12544 = 5330^2 + 112^2 .

It is not an unprimeable number, because it can be changed into a prime (28421443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3552677 + ... + 3552684.

It is an arithmetic number, because the mean of its divisors is an integer number (8289589).

Almost surely, 2^28421444 is an apocalyptic number.

It is an amenable number.

28421444 is a deficient number, since it is larger than the sum of its proper divisors (21316090).

28421444 is a wasteful number, since it uses less digits than its factorization.

28421444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7105365 (or 7105363 counting only the distinct ones).

The product of its digits is 8192, while the sum is 29.

The square root of 28421444 is about 5331.1766055909. The cubic root of 28421444 is about 305.1748312346.

The spelling of 28421444 in words is "twenty-eight million, four hundred twenty-one thousand, four hundred forty-four".