217100075480 has 64 divisors (see below), whose sum is σ = 496871353440. Its totient is φ = 85358006272.

The previous prime is 217100075359. The next prime is 217100075483. The reversal of 217100075480 is 84570001712.

It is a self number, because there is not a number n which added to its sum of digits gives 217100075480.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217100075483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488072 + ... + 820008.

Almost surely, 2^217100075480 is an apocalyptic number.

217100075480 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 217100075480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248435676720).

217100075480 is an abundant number, since it is smaller than the sum of its proper divisors (279771277960).

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

217100075480 is a wasteful number, since it uses less digits than its factorization.

217100075480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332228 (or 332224 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The spelling of 217100075480 in words is "two hundred seventeen billion, one hundred million, seventy-five thousand, four hundred eighty".