217648080 has 320 divisors, whose sum is σ = 844945920. Its totient is φ = 51093504.

The previous prime is 217648073. The next prime is 217648121. The reversal of 217648080 is 80846712.

217648080 is a `hidden beast` number, since 2 + 1 + 7 + 648 + 0 + 8 + 0 = 666.

217648080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 645672 + ... + 646008.

It is an arithmetic number, because the mean of its divisors is an integer number (2640456).

Almost surely, 2^217648080 is an apocalyptic number.

217648080 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 217648080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (422472960).

217648080 is an abundant number, since it is smaller than the sum of its proper divisors (627297840).

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

217648080 is a wasteful number, since it uses less digits than its factorization.

217648080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 217648080 is about 14752.9007317205. The cubic root of 217648080 is about 601.5221352418.

The spelling of 217648080 in words is "two hundred seventeen million, six hundred forty-eight thousand, eighty".