28456751 has 4 divisors (see below), whose sum is σ = 28549752. Its totient is φ = 28363752.

The previous prime is 28456741. The next prime is 28456777. The reversal of 28456751 is 15765482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15765482 = 2 ⋅7882741.

It is a cyclic number.

It is not a de Polignac number, because 28456751 - 2¹⁴ = 28440367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28456741) 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, 46040 + ... + 46653.

It is an arithmetic number, because the mean of its divisors is an integer number (7137438).

Almost surely, 2^28456751 is an apocalyptic number.

28456751 is a deficient number, since it is larger than the sum of its proper divisors (93001).

28456751 is an equidigital number, since it uses as much as digits as its factorization.

28456751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93000.

The product of its digits is 67200, while the sum is 38.

The square root of 28456751 is about 5334.4869481516. The cubic root of 28456751 is about 305.3011484046.

The spelling of 28456751 in words is "twenty-eight million, four hundred fifty-six thousand, seven hundred fifty-one".