217082540 has 24 divisors (see below), whose sum is σ = 458243520. Its totient is φ = 86381568.

The previous prime is 217082539. The next prime is 217082557. The reversal of 217082540 is 45280712.

217082540 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, 24260 + ... + 31979.

It is an arithmetic number, because the mean of its divisors is an integer number (19093480).

Almost surely, 2^217082540 is an apocalyptic number.

217082540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217082540 is an abundant number, since it is smaller than the sum of its proper divisors (241160980).

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

217082540 is a wasteful number, since it uses less digits than its factorization.

217082540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56441 (or 56439 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 217082540 is about 14733.7211864485. The cubic root of 217082540 is about 601.0006819833. Note that the first 3 decimals are identical.

The spelling of 217082540 in words is "two hundred seventeen million, eighty-two thousand, five hundred forty".