285880465 has 16 divisors (see below), whose sum is σ = 375507216. Its totient is φ = 207648000.

The previous prime is 285880459. The next prime is 285880477. The reversal of 285880465 is 564088582.

It is a Cunningham number, because it is equal to 16908²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 131698576 + 154181889 = 11476^2 + 12417^2 .

It is not a de Polignac number, because 285880465 - 2⁵ = 285880433 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, 32086 + ... + 40015.

It is an arithmetic number, because the mean of its divisors is an integer number (23469201).

Almost surely, 2^285880465 is an apocalyptic number.

It is an amenable number.

285880465 is a deficient number, since it is larger than the sum of its proper divisors (89626751).

285880465 is a wasteful number, since it uses less digits than its factorization.

285880465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72180.

The product of its (nonzero) digits is 614400, while the sum is 46.

The square root of 285880465 is about 16908.0000295718. Note that the first 4 decimals coincide. The cubic root of 285880465 is about 658.7614244280.

The spelling of 285880465 in words is "two hundred eighty-five million, eight hundred eighty thousand, four hundred sixty-five".