28540557 has 12 divisors (see below), whose sum is σ = 41443584. Its totient is φ = 18926280.

The previous prime is 28540549. The next prime is 28540571. The reversal of 28540557 is 75504582.

It is a happy number.

It is not a de Polignac number, because 28540557 - 2³ = 28540549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6583 + ... + 10020.

It is an arithmetic number, because the mean of its divisors is an integer number (3453632).

Almost surely, 2^28540557 is an apocalyptic number.

It is an amenable number.

28540557 is a deficient number, since it is larger than the sum of its proper divisors (12903027).

28540557 is a wasteful number, since it uses less digits than its factorization.

28540557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16800 (or 16797 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 28540557 is about 5342.3362866821. The cubic root of 28540557 is about 305.6005617354.

The spelling of 28540557 in words is "twenty-eight million, five hundred forty thousand, five hundred fifty-seven".