28257149 has 8 divisors (see below), whose sum is σ = 29020992. Its totient is φ = 27498240.

The previous prime is 28257137. The next prime is 28257157. The reversal of 28257149 is 94175282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28257149 - 2¹² = 28253053 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 (28257169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12317 + ... + 14429.

It is an arithmetic number, because the mean of its divisors is an integer number (3627624).

Almost surely, 2^28257149 is an apocalyptic number.

It is an amenable number.

28257149 is a deficient number, since it is larger than the sum of its proper divisors (763843).

28257149 is a wasteful number, since it uses less digits than its factorization.

28257149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467.

The product of its digits is 40320, while the sum is 38.

The square root of 28257149 is about 5315.7453851741. The cubic root of 28257149 is about 304.5856561253.

The spelling of 28257149 in words is "twenty-eight million, two hundred fifty-seven thousand, one hundred forty-nine".