28449812 has 12 divisors (see below), whose sum is σ = 51504180. Its totient is φ = 13734336.

The previous prime is 28449803. The next prime is 28449833. The reversal of 28449812 is 21894482.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 18627856 = 3134^2 + 4316^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122513 + ... + 122744.

It is an arithmetic number, because the mean of its divisors is an integer number (4292015).

Almost surely, 2^28449812 is an apocalyptic number.

It is an amenable number.

28449812 is a deficient number, since it is larger than the sum of its proper divisors (23054368).

28449812 is a wasteful number, since it uses less digits than its factorization.

28449812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245290 (or 245288 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 28449812 is about 5333.8365179297. The cubic root of 28449812 is about 305.2763311315.

The spelling of 28449812 in words is "twenty-eight million, four hundred forty-nine thousand, eight hundred twelve".