28857501 has 12 divisors (see below), whose sum is σ = 41762812. Its totient is φ = 19201536.

The previous prime is 28857487. The next prime is 28857509. The reversal of 28857501 is 10575882.

28857501 is a `hidden beast` number, since 2 + 88 + 575 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28100601 + 756900 = 5301^2 + 870^2 .

It is not a de Polignac number, because 28857501 - 2⁵ = 28857469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857509) 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 11 ways as a sum of consecutive naturals, for example, 2415 + ... + 7971.

Almost surely, 2^28857501 is an apocalyptic number.

It is an amenable number.

28857501 is a deficient number, since it is larger than the sum of its proper divisors (12905311).

28857501 is a wasteful number, since it uses less digits than its factorization.

28857501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140 (or 6137 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 28857501 is about 5371.9178139655. The cubic root of 28857501 is about 306.7276352997.

The spelling of 28857501 in words is "twenty-eight million, eight hundred fifty-seven thousand, five hundred one".