217080878 has 12 divisors (see below), whose sum is σ = 378784152. Its totient is φ = 93034620.

The previous prime is 217080869. The next prime is 217080881. The reversal of 217080878 is 878080712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1107458 + ... + 1107653.

It is an arithmetic number, because the mean of its divisors is an integer number (31565346).

Almost surely, 2^217080878 is an apocalyptic number.

217080878 is a deficient number, since it is larger than the sum of its proper divisors (161703274).

217080878 is a wasteful number, since it uses less digits than its factorization.

217080878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215127 (or 2215120 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 217080878 is about 14733.6647851103. The cubic root of 217080878 is about 600.9991482108. Note that the first 3 decimals are identical.

The spelling of 217080878 in words is "two hundred seventeen million, eighty thousand, eight hundred seventy-eight".