28126457 has 4 divisors (see below), whose sum is σ = 28138896. Its totient is φ = 28114020.

The previous prime is 28126453. The next prime is 28126471. The reversal of 28126457 is 75462182.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28126457 - 2² = 28126453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28126453) 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, 1763 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (7034724).

Almost surely, 2^28126457 is an apocalyptic number.

It is an amenable number.

28126457 is a deficient number, since it is larger than the sum of its proper divisors (12439).

28126457 is an equidigital number, since it uses as much as digits as its factorization.

28126457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438.

The product of its digits is 26880, while the sum is 35.

The square root of 28126457 is about 5303.4382243975. The cubic root of 28126457 is about 304.1153511062.

The spelling of 28126457 in words is "twenty-eight million, one hundred twenty-six thousand, four hundred fifty-seven".