28317743 has 4 divisors (see below), whose sum is σ = 28392840. Its totient is φ = 28242648.

The previous prime is 28317727. The next prime is 28317749. The reversal of 28317743 is 34771382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34771382 = 2 ⋅17385691.

It is a cyclic number.

It is not a de Polignac number, because 28317743 - 2⁴ = 28317727 is a prime.

It is a super-2 number, since 2×28317743² = 1603789137228098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28317749) 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, 36980 + ... + 37737.

It is an arithmetic number, because the mean of its divisors is an integer number (7098210).

Almost surely, 2^28317743 is an apocalyptic number.

28317743 is a deficient number, since it is larger than the sum of its proper divisors (75097).

28317743 is an equidigital number, since it uses as much as digits as its factorization.

28317743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75096.

The product of its digits is 28224, while the sum is 35.

The square root of 28317743 is about 5321.4418158991. The cubic root of 28317743 is about 304.8032162512.

The spelling of 28317743 in words is "twenty-eight million, three hundred seventeen thousand, seven hundred forty-three".