213287885 has 8 divisors (see below), whose sum is σ = 256820760. Its totient is φ = 170046784.

The previous prime is 213287849. The next prime is 213287897. The reversal of 213287885 is 588782312.

It can be written as a sum of positive squares in 4 ways, for example, as 18992164 + 194295721 = 4358^2 + 13939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213287885 - 2¹² = 213283789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71330 + ... + 74259.

It is an arithmetic number, because the mean of its divisors is an integer number (32102595).

Almost surely, 2^213287885 is an apocalyptic number.

It is an amenable number.

213287885 is a deficient number, since it is larger than the sum of its proper divisors (43532875).

213287885 is a wasteful number, since it uses less digits than its factorization.

213287885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145887.

The product of its digits is 215040, while the sum is 44.

The square root of 213287885 is about 14604.3789665977. The cubic root of 213287885 is about 597.4781981156.

The spelling of 213287885 in words is "two hundred thirteen million, two hundred eighty-seven thousand, eight hundred eighty-five".