28818743 has 4 divisors (see below), whose sum is σ = 28847520. Its totient is φ = 28789968.

The previous prime is 28818733. The next prime is 28818749. The reversal of 28818743 is 34781882.

Added to its reverse (34781882) it gives a square (63600625 = 7975²).

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28818743 - 2¹² = 28814647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28818743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28818749) 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, 12830 + ... + 14907.

It is an arithmetic number, because the mean of its divisors is an integer number (7211880).

Almost surely, 2^28818743 is an apocalyptic number.

28818743 is a deficient number, since it is larger than the sum of its proper divisors (28777).

28818743 is a wasteful number, since it uses less digits than its factorization.

28818743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28776.

The product of its digits is 86016, while the sum is 41.

The square root of 28818743 is about 5368.3091378944. The cubic root of 28818743 is about 306.5902536196.

Adding to 28818743 its reverse (34781882), we get a square (63600625 = 7975²).

The spelling of 28818743 in words is "twenty-eight million, eight hundred eighteen thousand, seven hundred forty-three".