285131280 has 160 divisors (see below), whose sum is σ = 1033933824. Its totient is φ = 63641088.

The previous prime is 285131279. The next prime is 285131333. The reversal of 285131280 is 82131582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70267 + ... + 74213.

Almost surely, 2^285131280 is an apocalyptic number.

285131280 is a gapful number since it is divisible by the number (20) 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 285131280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516966912).

285131280 is an abundant number, since it is smaller than the sum of its proper divisors (748802544).

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

285131280 is a wasteful number, since it uses less digits than its factorization.

285131280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013 (or 4007 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 285131280 is about 16885.8307465164. The cubic root of 285131280 is about 658.1854658377.

The spelling of 285131280 in words is "two hundred eighty-five million, one hundred thirty-one thousand, two hundred eighty".