284128863721 has 8 divisors (see below), whose sum is σ = 289580339520. Its totient is φ = 278680741872.

The previous prime is 284128863679. The next prime is 284128863749. The reversal of 284128863721 is 127368821482.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-284128863721 is a prime.

It is a super-2 number, since 2×284128863721² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (284128863751) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 667101 + ... + 1006618.

It is an arithmetic number, because the mean of its divisors is an integer number (36197542440).

Almost surely, 2^284128863721 is an apocalyptic number.

It is an amenable number.

284128863721 is a deficient number, since it is larger than the sum of its proper divisors (5451475799).

284128863721 is a wasteful number, since it uses less digits than its factorization.

284128863721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676975.

The product of its digits is 2064384, while the sum is 52.

The spelling of 284128863721 in words is "two hundred eighty-four billion, one hundred twenty-eight million, eight hundred sixty-three thousand, seven hundred twenty-one".