28404148 has 6 divisors (see below), whose sum is σ = 49707266. Its totient is φ = 14202072.

The previous prime is 28404143. The next prime is 28404169. The reversal of 28404148 is 84140482.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 11985444 = 4052^2 + 3462^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404143) 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 as a sum of consecutive naturals, namely, 3550515 + ... + 3550522.

Almost surely, 2^28404148 is an apocalyptic number.

It is an amenable number.

28404148 is a deficient number, since it is larger than the sum of its proper divisors (21303118).

28404148 is a wasteful number, since it uses less digits than its factorization.

28404148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7101041 (or 7101039 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 28404148 is about 5329.5542027453. The cubic root of 28404148 is about 305.1129134921.

It can be divided in two parts, 284041 and 48, that added together give a square (284089 = 533²).

The spelling of 28404148 in words is "twenty-eight million, four hundred four thousand, one hundred forty-eight".