284721980 has 24 divisors (see below), whose sum is σ = 617205120. Its totient is φ = 110214720.

The previous prime is 284721893. The next prime is 284722003. The reversal of 284721980 is 89127482.

It is a super-3 number, since 3×284721980³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228995 + ... + 230234.

It is an arithmetic number, because the mean of its divisors is an integer number (25716880).

Almost surely, 2^284721980 is an apocalyptic number.

284721980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

284721980 is an abundant number, since it is smaller than the sum of its proper divisors (332483140).

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

284721980 is a wasteful number, since it uses less digits than its factorization.

284721980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459269 (or 459267 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 284721980 is about 16873.7067652606. The cubic root of 284721980 is about 657.8703778568.

The spelling of 284721980 in words is "two hundred eighty-four million, seven hundred twenty-one thousand, nine hundred eighty".