217026040 has 128 divisors (see below), whose sum is σ = 628715520. Its totient is φ = 65433600.

The previous prime is 217026011. The next prime is 217026049. The reversal of 217026040 is 40620712.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217026049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94344 + ... + 96616.

It is an arithmetic number, because the mean of its divisors is an integer number (4911840).

Almost surely, 2^217026040 is an apocalyptic number.

217026040 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 217026040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314357760).

217026040 is an abundant number, since it is smaller than the sum of its proper divisors (411689480).

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

217026040 is a wasteful number, since it uses less digits than its factorization.

217026040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 217026040 is about 14731.8036913339. The cubic root of 217026040 is about 600.9485367103.

Adding to 217026040 its reverse (40620712), we get a palindrome (257646752).

The spelling of 217026040 in words is "two hundred seventeen million, twenty-six thousand, forty".