217048140 has 96 divisors (see below), whose sum is σ = 681428160. Its totient is φ = 57351168.

The previous prime is 217048123. The next prime is 217048147. The reversal of 217048140 is 41840712.

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

It is not an unprimeable number, because it can be changed into a prime (217048147) 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, 59242 + ... + 62798.

It is an arithmetic number, because the mean of its divisors is an integer number (7098210).

Almost surely, 2^217048140 is an apocalyptic number.

217048140 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 217048140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340714080).

217048140 is an abundant number, since it is smaller than the sum of its proper divisors (464380020).

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

217048140 is a wasteful number, since it uses less digits than its factorization.

217048140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688 (or 3680 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 217048140 is about 14732.5537501141. The cubic root of 217048140 is about 600.9689344345.

Adding to 217048140 its reverse (41840712), we get a palindrome (258888852).

The spelling of 217048140 in words is "two hundred seventeen million, forty-eight thousand, one hundred forty".