28557549 has 16 divisors (see below), whose sum is σ = 42906240. Its totient is φ = 18768960.

The previous prime is 28557539. The next prime is 28557553. The reversal of 28557549 is 94575582.

It is not a de Polignac number, because 28557549 - 2¹² = 28553453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5532 + ... + 9365.

It is an arithmetic number, because the mean of its divisors is an integer number (2681640).

Almost surely, 2^28557549 is an apocalyptic number.

It is an amenable number.

28557549 is a deficient number, since it is larger than the sum of its proper divisors (14348691).

28557549 is a wasteful number, since it uses less digits than its factorization.

28557549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14977 (or 14971 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 28557549 is about 5343.9263655107. The cubic root of 28557549 is about 305.6611974892.

It can be divided in two parts, 2855 and 7549, that added together give a square (10404 = 102²).

The spelling of 28557549 in words is "twenty-eight million, five hundred fifty-seven thousand, five hundred forty-nine".