213644164 has 6 divisors (see below), whose sum is σ = 373877294. Its totient is φ = 106822080.

The previous prime is 213644159. The next prime is 213644177. The reversal of 213644164 is 461446312.

It can be written as a sum of positive squares in only one way, i.e., 129004164 + 84640000 = 11358^2 + 9200^2 .

It is a super-2 number, since 2×213644164² = 91287657622517792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26705517 + ... + 26705524.

Almost surely, 2^213644164 is an apocalyptic number.

It is an amenable number.

213644164 is a deficient number, since it is larger than the sum of its proper divisors (160233130).

213644164 is a wasteful number, since it uses less digits than its factorization.

213644164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53411045 (or 53411043 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 213644164 is about 14616.5715542325. The cubic root of 213644164 is about 597.8106916347.

The spelling of 213644164 in words is "two hundred thirteen million, six hundred forty-four thousand, one hundred sixty-four".