217478448 has 120 divisors (see below), whose sum is σ = 667832256. Its totient is φ = 65520000.

The previous prime is 217478419. The next prime is 217478491. The reversal of 217478448 is 844874712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397311 + ... + 397857.

Almost surely, 2^217478448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217478448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333916128).

217478448 is an abundant number, since it is smaller than the sum of its proper divisors (450353808).

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

217478448 is a wasteful number, since it uses less digits than its factorization.

217478448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 814 counting only the distinct ones).

The product of its digits is 401408, while the sum is 45.

The square root of 217478448 is about 14747.1505044195. The cubic root of 217478448 is about 601.3658218586.

The spelling of 217478448 in words is "two hundred seventeen million, four hundred seventy-eight thousand, four hundred forty-eight".