284128985 has 16 divisors (see below), whose sum is σ = 390093312. Its totient is φ = 194616000.

The previous prime is 284128969. The next prime is 284128991. The reversal of 284128985 is 589821482.

It is not a de Polignac number, because 284128985 - 2⁴ = 284128969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31760 + ... + 39710.

It is an arithmetic number, because the mean of its divisors is an integer number (24380832).

Almost surely, 2^284128985 is an apocalyptic number.

It is an amenable number.

284128985 is a deficient number, since it is larger than the sum of its proper divisors (105964327).

284128985 is a wasteful number, since it uses less digits than its factorization.

284128985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8984.

The product of its digits is 368640, while the sum is 47.

The square root of 284128985 is about 16856.1260377348. The cubic root of 284128985 is about 657.4133413814.

The spelling of 284128985 in words is "two hundred eighty-four million, one hundred twenty-eight thousand, nine hundred eighty-five".