218680464 has 20 divisors (see below), whose sum is σ = 564924656. Its totient is φ = 72893472.

The previous prime is 218680463. The next prime is 218680489. The reversal of 218680464 is 464086812.

It is a super-2 number, since 2×218680464² = 95642290670510592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (218680463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277874 + ... + 2277969.

Almost surely, 2^218680464 is an apocalyptic number.

218680464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

218680464 is an abundant number, since it is smaller than the sum of its proper divisors (346244192).

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

218680464 is a wasteful number, since it uses less digits than its factorization.

218680464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555854 (or 4555848 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 218680464 is about 14787.8485250560. The cubic root of 218680464 is about 602.4717148386.

The spelling of 218680464 in words is "two hundred eighteen million, six hundred eighty thousand, four hundred sixty-four".