213664756 has 12 divisors (see below), whose sum is σ = 390170592. Its totient is φ = 102187448.

The previous prime is 213664753. The next prime is 213664811. The reversal of 213664756 is 657466312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213664753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161130 + ... + 1161313.

It is an arithmetic number, because the mean of its divisors is an integer number (32514216).

Almost surely, 2^213664756 is an apocalyptic number.

It is an amenable number.

213664756 is a deficient number, since it is larger than the sum of its proper divisors (176505836).

213664756 is a wasteful number, since it uses less digits than its factorization.

213664756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322470 (or 2322468 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The square root of 213664756 is about 14617.2759432119. The cubic root of 213664756 is about 597.8298975923.

The spelling of 213664756 in words is "two hundred thirteen million, six hundred sixty-four thousand, seven hundred fifty-six".