217552072 has 8 divisors (see below), whose sum is σ = 407910150. Its totient is φ = 108776032.

The previous prime is 217552037. The next prime is 217552073. The reversal of 217552072 is 270255712.

It can be written as a sum of positive squares in only one way, i.e., 210656196 + 6895876 = 14514^2 + 2626^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (217552073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13596997 + ... + 13597012.

Almost surely, 2^217552072 is an apocalyptic number.

It is an amenable number.

217552072 is a deficient number, since it is larger than the sum of its proper divisors (190358078).

217552072 is a wasteful number, since it uses less digits than its factorization.

217552072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27194015 (or 27194011 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 217552072 is about 14749.6465042387. The cubic root of 217552072 is about 601.4336752672.

The spelling of 217552072 in words is "two hundred seventeen million, five hundred fifty-two thousand, seventy-two".