28444456 has 8 divisors (see below), whose sum is σ = 53333370. Its totient is φ = 14222224.

The previous prime is 28444433. The next prime is 28444459. The reversal of 28444456 is 65444482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17355556 + 11088900 = 4166^2 + 3330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28444459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777771 + ... + 1777786.

Almost surely, 2^28444456 is an apocalyptic number.

It is an amenable number.

28444456 is a deficient number, since it is larger than the sum of its proper divisors (24888914).

28444456 is a wasteful number, since it uses less digits than its factorization.

28444456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555563 (or 3555559 counting only the distinct ones).

The product of its digits is 122880, while the sum is 37.

The square root of 28444456 is about 5333.3344166666. The cubic root of 28444456 is about 305.2571726845.

It can be divided in two parts, 28444 and 456, that added together give a square (28900 = 170²).

The spelling of 28444456 in words is "twenty-eight million, four hundred forty-four thousand, four hundred fifty-six".