217308136 has 16 divisors (see below), whose sum is σ = 421503300. Its totient is φ = 104907264.

The previous prime is 217308101. The next prime is 217308137. The reversal of 217308136 is 631803712.

It can be written as a sum of positive squares in 2 ways, for example, as 201356100 + 15952036 = 14190^2 + 3994^2 .

It is a junction number, because it is equal to n+sod(n) for n = 217308098 and 217308107.

It is not an unprimeable number, because it can be changed into a prime (217308137) 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, 468105 + ... + 468568.

Almost surely, 2^217308136 is an apocalyptic number.

It is an amenable number.

217308136 is a deficient number, since it is larger than the sum of its proper divisors (204195164).

217308136 is a wasteful number, since it uses less digits than its factorization.

217308136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936708 (or 936704 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 217308136 is about 14741.3749697917. The cubic root of 217308136 is about 601.2088000722.

The spelling of 217308136 in words is "two hundred seventeen million, three hundred eight thousand, one hundred thirty-six".