218500408 has 48 divisors (see below), whose sum is σ = 479142000. Its totient is φ = 93139200.

The previous prime is 218500379. The next prime is 218500409. The reversal of 218500408 is 804005812.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218500409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76608 + ... + 79408.

It is an arithmetic number, because the mean of its divisors is an integer number (9982125).

Almost surely, 2^218500408 is an apocalyptic number.

218500408 is a gapful number since it is divisible by the number (28) 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 218500408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239571000).

218500408 is an abundant number, since it is smaller than the sum of its proper divisors (260641592).

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

218500408 is a wasteful number, since it uses less digits than its factorization.

218500408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020 (or 3009 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 218500408 is about 14781.7592998939. The cubic root of 218500408 is about 602.3063160774.

The spelling of 218500408 in words is "two hundred eighteen million, five hundred thousand, four hundred eight".