213280685 has 8 divisors (see below), whose sum is σ = 256889880. Its totient is φ = 169989184.

The previous prime is 213280673. The next prime is 213280741. The reversal of 213280685 is 586082312.

It can be written as a sum of positive squares in 4 ways, for example, as 35271721 + 178008964 = 5939^2 + 13342^2 .

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 213280685 - 2⁸ = 213280429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77942 + ... + 80631.

It is an arithmetic number, because the mean of its divisors is an integer number (32111235).

Almost surely, 2^213280685 is an apocalyptic number.

It is an amenable number.

213280685 is a deficient number, since it is larger than the sum of its proper divisors (43609195).

213280685 is a wasteful number, since it uses less digits than its factorization.

213280685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158847.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 213280685 is about 14604.1324631078. The cubic root of 213280685 is about 597.4714749779.

The spelling of 213280685 in words is "two hundred thirteen million, two hundred eighty thousand, six hundred eighty-five".