217144364 has 12 divisors (see below), whose sum is σ = 389271288. Its totient is φ = 105924000.

The previous prime is 217144337. The next prime is 217144391. The reversal of 217144364 is 463441712.

217144364 is digitally balanced in base 2, 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 (217144337) and next prime (217144391).

It is a self number, because there is not a number n which added to its sum of digits gives 217144364.

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, 661862 + ... + 662189.

It is an arithmetic number, because the mean of its divisors is an integer number (32439274).

Almost surely, 2^217144364 is an apocalyptic number.

It is an amenable number.

217144364 is a deficient number, since it is larger than the sum of its proper divisors (172126924).

217144364 is a wasteful number, since it uses less digits than its factorization.

217144364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324096 (or 1324094 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 217144364 is about 14735.8190814084. The cubic root of 217144364 is about 601.0577305441.

The spelling of 217144364 in words is "two hundred seventeen million, one hundred forty-four thousand, three hundred sixty-four".