28404356 has 24 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 13293632.

The previous prime is 28404353. The next prime is 28404361. The reversal of 28404356 is 65340482.

It is not an unprimeable number, because it can be changed into a prime (28404353) 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, 1040 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (2207520).

Almost surely, 2^28404356 is an apocalyptic number.

It is an amenable number.

28404356 is a deficient number, since it is larger than the sum of its proper divisors (24576124).

28404356 is a wasteful number, since it uses less digits than its factorization.

28404356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6643 (or 6641 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 28404356 is about 5329.5737165368. The cubic root of 28404356 is about 305.1136582581.

The spelling of 28404356 in words is "twenty-eight million, four hundred four thousand, three hundred fifty-six".