8355866728 has 64 divisors (see below), whose sum is σ = 17688384000. Its totient is φ = 3666124800.

The previous prime is 8355866723. The next prime is 8355866747. The reversal of 8355866728 is 8276685538.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8355866723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1112008 + ... + 1119496.

It is an arithmetic number, because the mean of its divisors is an integer number (276381000).

Almost surely, 2^8355866728 is an apocalyptic number.

8355866728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8355866728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8844192000).

8355866728 is an abundant number, since it is smaller than the sum of its proper divisors (9332517272).

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

8355866728 is a wasteful number, since it uses less digits than its factorization.

8355866728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946 (or 7942 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 58.

The square root of 8355866728 is about 91410.4300832241. The cubic root of 8355866728 is about 2029.2263893615.

The spelling of 8355866728 in words is "eight billion, three hundred fifty-five million, eight hundred sixty-six thousand, seven hundred twenty-eight".