869221234728 has 768 divisors, whose sum is σ = 3162378240000. Its totient is φ = 220860984960.

The previous prime is 869221234699. The next prime is 869221234787. The reversal of 869221234728 is 827432122968.

869221234728 is a `hidden beast` number, since 8 + 69 + 2 + 212 + 347 + 28 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 421337425 + ... + 421339487.

It is an arithmetic number, because the mean of its divisors is an integer number (4117680000).

Almost surely, 2^869221234728 is an apocalyptic number.

869221234728 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 869221234728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581189120000).

869221234728 is an abundant number, since it is smaller than the sum of its proper divisors (2293157005272).

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

869221234728 is a wasteful number, since it uses less digits than its factorization.

869221234728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168 (or 2133 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 869221234728 in words is "eight hundred sixty-nine billion, two hundred twenty-one million, two hundred thirty-four thousand, seven hundred twenty-eight".