28656404 has 24 divisors (see below), whose sum is σ = 58648128. Its totient is φ = 11995200.

The previous prime is 28656403. The next prime is 28656409. The reversal of 28656404 is 40465682.

It is a super-2 number, since 2×28656404² = 1642378980422432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656401) 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, 10697 + ... + 13104.

It is an arithmetic number, because the mean of its divisors is an integer number (2443672).

Almost surely, 2^28656404 is an apocalyptic number.

It is an amenable number.

28656404 is an abundant number, since it is smaller than the sum of its proper divisors (29991724).

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

28656404 is a wasteful number, since it uses less digits than its factorization.

28656404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23855 (or 23853 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 28656404 is about 5353.1676603671. The cubic root of 28656404 is about 306.0134842478.

The spelling of 28656404 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred four".