28521656 has 16 divisors (see below), whose sum is σ = 55803600. Its totient is φ = 13640704.

The previous prime is 28521637. The next prime is 28521659. The reversal of 28521656 is 65612582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521659) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 77321 + ... + 77688.

It is an arithmetic number, because the mean of its divisors is an integer number (3487725).

Almost surely, 2^28521656 is an apocalyptic number.

It is an amenable number.

28521656 is a deficient number, since it is larger than the sum of its proper divisors (27281944).

28521656 is a wasteful number, since it uses less digits than its factorization.

28521656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155038 (or 155034 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 28521656 is about 5340.5670110954. The cubic root of 28521656 is about 305.5330854563.

The spelling of 28521656 in words is "twenty-eight million, five hundred twenty-one thousand, six hundred fifty-six".