285880720 has 20 divisors (see below), whose sum is σ = 664672860. Its totient is φ = 114352256.

The previous prime is 285880711. The next prime is 285880733. The reversal of 285880720 is 27088582.

It can be written as a sum of positive squares in 2 ways, for example, as 102657424 + 183223296 = 10132^2 + 13536^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786675 + ... + 1786834.

It is an arithmetic number, because the mean of its divisors is an integer number (33233643).

Almost surely, 2^285880720 is an apocalyptic number.

285880720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285880720 is an abundant number, since it is smaller than the sum of its proper divisors (378792140).

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

285880720 is a wasteful number, since it uses less digits than its factorization.

285880720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573522 (or 3573516 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 285880720 is about 16908.0075703792. The cubic root of 285880720 is about 658.7616202956.

The spelling of 285880720 in words is "two hundred eighty-five million, eight hundred eighty thousand, seven hundred twenty".