28020811983 has 8 divisors (see below), whose sum is σ = 38155999488. Its totient is φ = 18283082904.

The previous prime is 28020811981. The next prime is 28020812021. The reversal of 28020811983 is 38911802082.

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

It is not a de Polignac number, because 28020811983 - 2¹ = 28020811981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020811981) 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, 99364441 + ... + 99364722.

It is an arithmetic number, because the mean of its divisors is an integer number (4769499936).

Almost surely, 2^28020811983 is an apocalyptic number.

28020811983 is a deficient number, since it is larger than the sum of its proper divisors (10135187505).

28020811983 is a wasteful number, since it uses less digits than its factorization.

28020811983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198729213.

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 28020811983 in words is "twenty-eight billion, twenty million, eight hundred eleven thousand, nine hundred eighty-three".