28516057 has 4 divisors (see below), whose sum is σ = 28999440. Its totient is φ = 28032676.

The previous prime is 28516049. The next prime is 28516069. The reversal of 28516057 is 75061582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75061582 = 2 ⋅37530791.

It is a cyclic number.

It is not a de Polignac number, because 28516057 - 2³ = 28516049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28516027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241603 + ... + 241720.

It is an arithmetic number, because the mean of its divisors is an integer number (7249860).

Almost surely, 2^28516057 is an apocalyptic number.

It is an amenable number.

28516057 is a deficient number, since it is larger than the sum of its proper divisors (483383).

28516057 is an equidigital number, since it uses as much as digits as its factorization.

28516057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483382.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 28516057 is about 5340.0427900907. The cubic root of 28516057 is about 305.5130913894.

The spelling of 28516057 in words is "twenty-eight million, five hundred sixteen thousand, fifty-seven".