218666480 has 20 divisors (see below), whose sum is σ = 508399752. Its totient is φ = 87466560.

The previous prime is 218666479. The next prime is 218666507. The reversal of 218666480 is 84666812.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366586 + ... + 1366745.

Almost surely, 2^218666480 is an apocalyptic number.

218666480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218666480 is an abundant number, since it is smaller than the sum of its proper divisors (289733272).

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

218666480 is a wasteful number, since it uses less digits than its factorization.

218666480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733344 (or 2733338 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 218666480 is about 14787.3756968571. The cubic root of 218666480 is about 602.4588724416.

The spelling of 218666480 in words is "two hundred eighteen million, six hundred sixty-six thousand, four hundred eighty".