213668705 has 8 divisors (see below), whose sum is σ = 261240552. Its totient is φ = 167709568.

The previous prime is 213668687. The next prime is 213668711. The reversal of 213668705 is 507866312.

213668705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 102070609 + 111598096 = 10103^2 + 10564^2 .

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 213668705 - 2⁶ = 213668641 is a prime.

It is a super-3 number, since 3×213668705³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian 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, 402884 + ... + 403413.

It is an arithmetic number, because the mean of its divisors is an integer number (32655069).

Almost surely, 2^213668705 is an apocalyptic number.

It is an amenable number.

213668705 is a deficient number, since it is larger than the sum of its proper divisors (47571847).

213668705 is an equidigital number, since it uses as much as digits as its factorization.

213668705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806355.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 213668705 is about 14617.4110224759. The cubic root of 213668705 is about 597.8335806451.

The spelling of 213668705 in words is "two hundred thirteen million, six hundred sixty-eight thousand, seven hundred five".