28449930 has 16 divisors (see below), whose sum is σ = 68279904. Its totient is φ = 7586640.

The previous prime is 28449907. The next prime is 28449931. The reversal of 28449930 is 3994482.

It is not an unprimeable number, because it can be changed into a prime (28449931) 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 7 ways as a sum of consecutive naturals, for example, 474136 + ... + 474195.

It is an arithmetic number, because the mean of its divisors is an integer number (4267494).

Almost surely, 2^28449930 is an apocalyptic number.

28449930 is an abundant number, since it is smaller than the sum of its proper divisors (39829974).

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

28449930 is a wasteful number, since it uses less digits than its factorization.

28449930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948341.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28449930 is about 5333.8475793746. The cubic root of 28449930 is about 305.2767531912.

The spelling of 28449930 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred thirty".