28126451 has 4 divisors (see below), whose sum is σ = 28812504. Its totient is φ = 27440400.

The previous prime is 28126409. The next prime is 28126453. The reversal of 28126451 is 15462182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15462182 = 2 ⋅7731091.

It is a cyclic number.

It is not a de Polignac number, because 28126451 - 2¹⁸ = 27864307 is a prime.

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, 342965 + ... + 343046.

It is an arithmetic number, because the mean of its divisors is an integer number (7203126).

Almost surely, 2^28126451 is an apocalyptic number.

28126451 is a deficient number, since it is larger than the sum of its proper divisors (686053).

28126451 is an equidigital number, since it uses as much as digits as its factorization.

28126451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686052.

The product of its digits is 3840, while the sum is 29.

The square root of 28126451 is about 5303.4376587266. The cubic root of 28126451 is about 304.1153294814.

The spelling of 28126451 in words is "twenty-eight million, one hundred twenty-six thousand, four hundred fifty-one".