28389057 has 16 divisors (see below), whose sum is σ = 39434880. Its totient is φ = 18144000.

The previous prime is 28389047. The next prime is 28389083. The reversal of 28389057 is 75098382.

It is not a de Polignac number, because 28389057 - 2⁴ = 28389041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28389007) 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, 12057 + ... + 14217.

It is an arithmetic number, because the mean of its divisors is an integer number (2464680).

Almost surely, 2^28389057 is an apocalyptic number.

It is an amenable number.

28389057 is a deficient number, since it is larger than the sum of its proper divisors (11045823).

28389057 is a wasteful number, since it uses less digits than its factorization.

28389057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28389057 is about 5328.1382301889. The cubic root of 28389057 is about 305.0588688662.

The spelling of 28389057 in words is "twenty-eight million, three hundred eighty-nine thousand, fifty-seven".