213664636 has 18 divisors (see below), whose sum is σ = 397203968. Its totient is φ = 100547520.

The previous prime is 213664609. The next prime is 213664651. The reversal of 213664636 is 636466312.

It is a junction number, because it is equal to n+sod(n) for n = 213664595 and 213664604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91260 + ... + 93571.

Almost surely, 2^213664636 is an apocalyptic number.

It is an amenable number.

213664636 is a deficient number, since it is larger than the sum of its proper divisors (183539332).

213664636 is a wasteful number, since it uses less digits than its factorization.

213664636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184869 (or 184850 counting only the distinct ones).

The product of its digits is 93312, while the sum is 37.

The square root of 213664636 is about 14617.2718384793. The cubic root of 213664636 is about 597.8297856731.

The spelling of 213664636 in words is "two hundred thirteen million, six hundred sixty-four thousand, six hundred thirty-six".