213778605 has 8 divisors (see below), whose sum is σ = 342045792. Its totient is φ = 114015248.

The previous prime is 213778597. The next prime is 213778619. The reversal of 213778605 is 506877312.

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 213778605 - 2³ = 213778597 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7125939 + ... + 7125968.

It is an arithmetic number, because the mean of its divisors is an integer number (42755724).

Almost surely, 2^213778605 is an apocalyptic number.

It is an amenable number.

213778605 is a deficient number, since it is larger than the sum of its proper divisors (128267187).

213778605 is a wasteful number, since it uses less digits than its factorization.

213778605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251915.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 213778605 is about 14621.1697548452. The cubic root of 213778605 is about 597.9360611795.

The spelling of 213778605 in words is "two hundred thirteen million, seven hundred seventy-eight thousand, six hundred five".