28056404 has 12 divisors (see below), whose sum is σ = 49424928. Its totient is φ = 13935000.

The previous prime is 28056403. The next prime is 28056419. The reversal of 28056404 is 40465082.

It is a super-2 number, since 2×28056404² = 1574323610822432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22622 + ... + 23829.

It is an arithmetic number, because the mean of its divisors is an integer number (4118744).

Almost surely, 2^28056404 is an apocalyptic number.

It is an amenable number.

28056404 is a deficient number, since it is larger than the sum of its proper divisors (21368524).

28056404 is a wasteful number, since it uses less digits than its factorization.

28056404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46606 (or 46604 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28056404 is about 5296.8296177997. The cubic root of 28056404 is about 303.8626601463.

The spelling of 28056404 in words is "twenty-eight million, fifty-six thousand, four hundred four".