28457656 has 8 divisors (see below), whose sum is σ = 53358120. Its totient is φ = 14228824.

The previous prime is 28457641. The next prime is 28457669. The reversal of 28457656 is 65675482.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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, 1778596 + ... + 1778611.

It is an arithmetic number, because the mean of its divisors is an integer number (6669765).

Almost surely, 2^28457656 is an apocalyptic number.

It is an amenable number.

28457656 is a deficient number, since it is larger than the sum of its proper divisors (24900464).

28457656 is a wasteful number, since it uses less digits than its factorization.

28457656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557213 (or 3557209 counting only the distinct ones).

The product of its digits is 403200, while the sum is 43.

The square root of 28457656 is about 5334.5717728792. The cubic root of 28457656 is about 305.3043848318.

It can be divided in two parts, 2845 and 7656, that added together give a palindrome (10501).

The spelling of 28457656 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred fifty-six".