28317983238 has 64 divisors (see below), whose sum is σ = 64575403200. Its totient is φ = 9193144320.

The previous prime is 28317983209. The next prime is 28317983303. The reversal of 28317983238 is 83238971382.

28317983238 is a `hidden beast` number, since 2 + 8 + 317 + 98 + 3 + 238 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1302118 + ... + 1323686.

It is an arithmetic number, because the mean of its divisors is an integer number (1008990675).

Almost surely, 2^28317983238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28317983238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32287701600).

28317983238 is an abundant number, since it is smaller than the sum of its proper divisors (36257419962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28317983238 is a wasteful number, since it uses less digits than its factorization.

28317983238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22214 (or 22208 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 28317983238 in words is "twenty-eight billion, three hundred seventeen million, nine hundred eighty-three thousand, two hundred thirty-eight".