213664064 has 14 divisors (see below), whose sum is σ = 423989754. Its totient is φ = 106832000.

The previous prime is 213664057. The next prime is 213664067. The reversal of 213664064 is 460466312.

It can be written as a sum of positive squares in only one way, i.e., 213393664 + 270400 = 14608^2 + 520^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 213664064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213664067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1669187 + ... + 1669314.

Almost surely, 2^213664064 is an apocalyptic number.

It is an amenable number.

213664064 is a deficient number, since it is larger than the sum of its proper divisors (210325690).

213664064 is an equidigital number, since it uses as much as digits as its factorization.

213664064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338513 (or 3338503 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 213664064 is about 14617.2522725716. The cubic root of 213664064 is about 597.8292521907.

The spelling of 213664064 in words is "two hundred thirteen million, six hundred sixty-four thousand, sixty-four".