213667664 has 20 divisors (see below), whose sum is σ = 473121504. Its totient is φ = 91571808.

The previous prime is 213667661. The next prime is 213667691. The reversal of 213667664 is 466766312.

213667664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213667661) 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, 953762 + ... + 953985.

Almost surely, 2^213667664 is an apocalyptic number.

It is an amenable number.

213667664 is an abundant number, since it is smaller than the sum of its proper divisors (259453840).

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

213667664 is a wasteful number, since it uses less digits than its factorization.

213667664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907762 (or 1907756 counting only the distinct ones).

The product of its digits is 217728, while the sum is 41.

The square root of 213667664 is about 14617.3754142117. The cubic root of 213667664 is about 597.8326097562.

The spelling of 213667664 in words is "two hundred thirteen million, six hundred sixty-seven thousand, six hundred sixty-four".