28512457 has 4 divisors (see below), whose sum is σ = 28525840. Its totient is φ = 28499076.

The previous prime is 28512439. The next prime is 28512487. The reversal of 28512457 is 75421582.

It is a happy number.

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: 75421582 = 2 ⋅37710791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28512457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28512427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2703 + ... + 8020.

It is an arithmetic number, because the mean of its divisors is an integer number (7131460).

Almost surely, 2^28512457 is an apocalyptic number.

It is an amenable number.

28512457 is a deficient number, since it is larger than the sum of its proper divisors (13383).

28512457 is a wasteful number, since it uses less digits than its factorization.

28512457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13382.

The product of its digits is 22400, while the sum is 34.

The square root of 28512457 is about 5339.7057035009. The cubic root of 28512457 is about 305.5002343826.

The spelling of 28512457 in words is "twenty-eight million, five hundred twelve thousand, four hundred fifty-seven".