284889857 has 8 divisors (see below), whose sum is σ = 342724800. Its totient is φ = 231339024.

The previous prime is 284889841. The next prime is 284889887. The reversal of 284889857 is 758988482.

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

It is not a de Polignac number, because 284889857 - 2⁴ = 284889841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 284889796 and 284889805.

It is not an unprimeable number, because it can be changed into a prime (284889887) 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, 1070882 + ... + 1071147.

It is an arithmetic number, because the mean of its divisors is an integer number (42840600).

Almost surely, 2^284889857 is an apocalyptic number.

It is an amenable number.

284889857 is a deficient number, since it is larger than the sum of its proper divisors (57834943).

284889857 is a wasteful number, since it uses less digits than its factorization.

284889857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142055.

The product of its digits is 10321920, while the sum is 59.

The square root of 284889857 is about 16878.6805467726. The cubic root of 284889857 is about 657.9996497013. Note that the first 3 decimals are identical.

The spelling of 284889857 in words is "two hundred eighty-four million, eight hundred eighty-nine thousand, eight hundred fifty-seven".