213660408 has 32 divisors (see below), whose sum is σ = 575240400. Its totient is φ = 65741568.

The previous prime is 213660397. The next prime is 213660413. The reversal of 213660408 is 804066312.

213660408 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 342093 + ... + 342716.

Almost surely, 2^213660408 is an apocalyptic number.

It is an amenable number.

213660408 is an abundant number, since it is smaller than the sum of its proper divisors (361579992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213660408 is a wasteful number, since it uses less digits than its factorization.

213660408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684831 (or 684827 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 213660408 is about 14617.1272143332. The cubic root of 213660408 is about 597.8258423579.

The spelling of 213660408 in words is "two hundred thirteen million, six hundred sixty thousand, four hundred eight".