217640130 has 32 divisors (see below), whose sum is σ = 523248768. Its totient is φ = 57936000.

The previous prime is 217640123. The next prime is 217640149. The reversal of 217640130 is 31046712.

It is a self number, because there is not a number n which added to its sum of digits gives 217640130.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11995 + ... + 24065.

It is an arithmetic number, because the mean of its divisors is an integer number (16351524).

Almost surely, 2^217640130 is an apocalyptic number.

217640130 is an abundant number, since it is smaller than the sum of its proper divisors (305608638).

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

217640130 is a wasteful number, since it uses less digits than its factorization.

217640130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12682.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 217640130 is about 14752.6312907223. The cubic root of 217640130 is about 601.5148112485.

Adding to 217640130 its reverse (31046712), we get a palindrome (248686842).

The spelling of 217640130 in words is "two hundred seventeen million, six hundred forty thousand, one hundred thirty".