217115240 has 32 divisors (see below), whose sum is σ = 489451680. Its totient is φ = 86678592.

The previous prime is 217115237. The next prime is 217115321. The reversal of 217115240 is 42511712.

217115240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16919 + ... + 26841.

It is an arithmetic number, because the mean of its divisors is an integer number (15295365).

Almost surely, 2^217115240 is an apocalyptic number.

217115240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217115240 is an abundant number, since it is smaller than the sum of its proper divisors (272336440).

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

217115240 is a wasteful number, since it uses less digits than its factorization.

217115240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481 (or 10477 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 217115240 is about 14734.8308439561. The cubic root of 217115240 is about 601.0308575033.

Adding to 217115240 its reverse (42511712), we get a palindrome (259626952).

The spelling of 217115240 in words is "two hundred seventeen million, one hundred fifteen thousand, two hundred forty".