28857456 has 60 divisors (see below), whose sum is σ = 84281808. Its totient is φ = 9199872.

The previous prime is 28857443. The next prime is 28857467. The reversal of 28857456 is 65475882.

28857456 is a `hidden beast` number, since 28 + 8 + 574 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1045 + ... + 7668.

Almost surely, 2^28857456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28857456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42140904).

28857456 is an abundant number, since it is smaller than the sum of its proper divisors (55424352).

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

28857456 is a wasteful number, since it uses less digits than its factorization.

28857456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8750 (or 8741 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28857456 is about 5371.9136255156. The cubic root of 28857456 is about 306.7274758640.

The spelling of 28857456 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred fifty-six".