28006743 has 8 divisors (see below), whose sum is σ = 38351728. Its totient is φ = 18166464.

The previous prime is 28006697. The next prime is 28006753. The reversal of 28006743 is 34760082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28006743 - 2⁶ = 28006679 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 28006743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126046 + ... + 126267.

It is an arithmetic number, because the mean of its divisors is an integer number (4793966).

Almost surely, 2^28006743 is an apocalyptic number.

28006743 is a deficient number, since it is larger than the sum of its proper divisors (10344985).

28006743 is a wasteful number, since it uses less digits than its factorization.

28006743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252353.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 28006743 is about 5292.1397373841. The cubic root of 28006743 is about 303.6832710876.

The spelling of 28006743 in words is "twenty-eight million, six thousand, seven hundred forty-three".