28212983 has 4 divisors (see below), whose sum is σ = 28232088. Its totient is φ = 28193880.

The previous prime is 28212971. The next prime is 28213067. The reversal of 28212983 is 38921282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38921282 = 2 ⋅19460641.

It is a cyclic number.

It is not a de Polignac number, because 28212983 - 2¹⁴ = 28196599 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 (28212913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7133 + ... + 10358.

It is an arithmetic number, because the mean of its divisors is an integer number (7058022).

Almost surely, 2^28212983 is an apocalyptic number.

28212983 is a deficient number, since it is larger than the sum of its proper divisors (19105).

28212983 is a wasteful number, since it uses less digits than its factorization.

28212983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19104.

The product of its digits is 13824, while the sum is 35.

The square root of 28212983 is about 5311.5894984458. The cubic root of 28212983 is about 304.4268839758.

The spelling of 28212983 in words is "twenty-eight million, two hundred twelve thousand, nine hundred eighty-three".