28718023 has 4 divisors (see below), whose sum is σ = 29385928. Its totient is φ = 28050120.

The previous prime is 28718021. The next prime is 28718029. The reversal of 28718023 is 32081782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32081782 = 2 ⋅16040891.

It is a cyclic number.

It is not a de Polignac number, because 28718023 - 2¹ = 28718021 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 (28718021) 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, 333888 + ... + 333973.

It is an arithmetic number, because the mean of its divisors is an integer number (7346482).

Almost surely, 2^28718023 is an apocalyptic number.

28718023 is a deficient number, since it is larger than the sum of its proper divisors (667905).

28718023 is an equidigital number, since it uses as much as digits as its factorization.

28718023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667904.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28718023 is about 5358.9199471535. The cubic root of 28718023 is about 306.2326644081.

The spelling of 28718023 in words is "twenty-eight million, seven hundred eighteen thousand, twenty-three".