28683021 has 8 divisors (see below), whose sum is σ = 39133600. Its totient is φ = 18677232.

The previous prime is 28682981. The next prime is 28683041. The reversal of 28683021 is 12038682.

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

It is not a de Polignac number, because 28683021 - 2¹¹ = 28680973 is a prime.

It is a super-4 number, since 4×28683021⁴ (a number of 31 digits) contains 4444 as substring.

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 28683021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28683041) 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, 111046 + ... + 111303.

It is an arithmetic number, because the mean of its divisors is an integer number (4891700).

Almost surely, 2^28683021 is an apocalyptic number.

It is an amenable number.

28683021 is a deficient number, since it is larger than the sum of its proper divisors (10450579).

28683021 is a wasteful number, since it uses less digits than its factorization.

28683021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222395.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28683021 is about 5355.6531814523. The cubic root of 28683021 is about 306.1082000209.

The spelling of 28683021 in words is "twenty-eight million, six hundred eighty-three thousand, twenty-one".