28649328 has 20 divisors (see below), whose sum is σ = 74010888. Its totient is φ = 9549760.

The previous prime is 28649323. The next prime is 28649339. The reversal of 28649328 is 82394682.

It is a self number, because there is not a number n which added to its sum of digits gives 28649328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28649323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298383 + ... + 298478.

Almost surely, 2^28649328 is an apocalyptic number.

It is an amenable number.

28649328 is an abundant number, since it is smaller than the sum of its proper divisors (45361560).

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

28649328 is a wasteful number, since it uses less digits than its factorization.

28649328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596872 (or 596866 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 28649328 is about 5352.5067024713. The cubic root of 28649328 is about 305.9882946524.

The spelling of 28649328 in words is "twenty-eight million, six hundred forty-nine thousand, three hundred twenty-eight".