213667644 has 12 divisors (see below), whose sum is σ = 498557864. Its totient is φ = 71222544.

The previous prime is 213667627. The next prime is 213667661. The reversal of 213667644 is 446766312.

It is a happy number.

213667644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213667627) and next prime (213667661).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8902807 + ... + 8902830.

Almost surely, 2^213667644 is an apocalyptic number.

It is an amenable number.

213667644 is an abundant number, since it is smaller than the sum of its proper divisors (284890220).

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

213667644 is a wasteful number, since it uses less digits than its factorization.

213667644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17805644 (or 17805642 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 213667644 is about 14617.3747300943. The cubic root of 213667644 is about 597.8325911031.

The spelling of 213667644 in words is "two hundred thirteen million, six hundred sixty-seven thousand, six hundred forty-four".