218642072 has 16 divisors (see below), whose sum is σ = 447222600. Its totient is φ = 99382720.

The previous prime is 218642069. The next prime is 218642077. The reversal of 218642072 is 270246812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218642077) 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 3 ways as a sum of consecutive naturals, for example, 1242197 + ... + 1242372.

Almost surely, 2^218642072 is an apocalyptic number.

218642072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

218642072 is an abundant number, since it is smaller than the sum of its proper divisors (228580528).

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

218642072 is a wasteful number, since it uses less digits than its factorization.

218642072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484586 (or 2484582 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 218642072 is about 14786.5503752566. The cubic root of 218642072 is about 602.4364557101.

Adding to 218642072 its reverse (270246812), we get a palindrome (488888884).

The spelling of 218642072 in words is "two hundred eighteen million, six hundred forty-two thousand, seventy-two".