28656556 has 6 divisors (see below), whose sum is σ = 50148980. Its totient is φ = 14328276.

The previous prime is 28656491. The next prime is 28656571. The reversal of 28656556 is 65565682.

It is a super-2 number, since 2×28656556² = 1642396403562272, which contains 22 as substring.

It is an unprimeable number.

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, 3582066 + ... + 3582073.

Almost surely, 2^28656556 is an apocalyptic number.

It is an amenable number.

28656556 is a deficient number, since it is larger than the sum of its proper divisors (21492424).

28656556 is a wasteful number, since it uses less digits than its factorization.

28656556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7164143 (or 7164141 counting only the distinct ones).

The product of its digits is 432000, while the sum is 43.

The square root of 28656556 is about 5353.1818575498. The cubic root of 28656556 is about 306.0140253016.

The spelling of 28656556 in words is "twenty-eight million, six hundred fifty-six thousand, five hundred fifty-six".