28706983 has 4 divisors (see below), whose sum is σ = 28723768. Its totient is φ = 28690200.

The previous prime is 28706969. The next prime is 28706987. The reversal of 28706983 is 38960782.

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 28706983 - 2²¹ = 26609831 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 (28706987) 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, 5493 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (7180942).

Almost surely, 2^28706983 is an apocalyptic number.

28706983 is a deficient number, since it is larger than the sum of its proper divisors (16785).

28706983 is a wasteful number, since it uses less digits than its factorization.

28706983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16784.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28706983 is about 5357.8897898333. The cubic root of 28706983 is about 306.1934179515.

The spelling of 28706983 in words is "twenty-eight million, seven hundred six thousand, nine hundred eighty-three".