28493444 has 12 divisors (see below), whose sum is σ = 56986944. Its totient is φ = 12211464.

The previous prime is 28493431. The next prime is 28493447. The reversal of 28493444 is 44439482.

28493444 is an admirable number.

It is a super-2 number, since 2×28493444² = 1623752701962272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28493398 and 28493407.

It is not an unprimeable number, because it can be changed into a prime (28493447) 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, 508784 + ... + 508839.

It is an arithmetic number, because the mean of its divisors is an integer number (4748912).

Almost surely, 2^28493444 is an apocalyptic number.

It is an amenable number.

28493444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28493444 is a wasteful number, since it uses less digits than its factorization.

28493444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017634 (or 1017632 counting only the distinct ones).

The product of its digits is 110592, while the sum is 38.

The square root of 28493444 is about 5337.9250650417. The cubic root of 28493444 is about 305.4323135725.

It can be divided in two parts, 2849344 and 4, that multiplied together give a square (11397376 = 3376²).

The spelling of 28493444 in words is "twenty-eight million, four hundred ninety-three thousand, four hundred forty-four".