218428732 has 12 divisors (see below), whose sum is σ = 382702320. Its totient is φ = 109085216.

The previous prime is 218428711. The next prime is 218428751. The reversal of 218428732 is 237824812.

218428732 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218428732² = 95422221926255648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 218428691 and 218428700.

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, 28432 + ... + 35287.

It is an arithmetic number, because the mean of its divisors is an integer number (31891860).

Almost surely, 2^218428732 is an apocalyptic number.

It is an amenable number.

218428732 is a deficient number, since it is larger than the sum of its proper divisors (164273588).

218428732 is a wasteful number, since it uses less digits than its factorization.

218428732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64580 (or 64578 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 218428732 is about 14779.3346264302. The cubic root of 218428732 is about 602.2404494896.

The spelling of 218428732 in words is "two hundred eighteen million, four hundred twenty-eight thousand, seven hundred thirty-two".