217380240 has 320 divisors, whose sum is σ = 934225920. Its totient is φ = 45135360.

The previous prime is 217380239. The next prime is 217380257. The reversal of 217380240 is 42083712.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165667 + ... + 166973.

It is an arithmetic number, because the mean of its divisors is an integer number (2919456).

Almost surely, 2^217380240 is an apocalyptic number.

217380240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217380240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467112960).

217380240 is an abundant number, since it is smaller than the sum of its proper divisors (716845680).

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

217380240 is a wasteful number, since it uses less digits than its factorization.

217380240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 217380240 is about 14743.8204004254. The cubic root of 217380240 is about 601.2752874826.

The spelling of 217380240 in words is "two hundred seventeen million, three hundred eighty thousand, two hundred forty".