216728178228 has 48 divisors (see below), whose sum is σ = 565135824960. Its totient is φ = 71825131872.

The previous prime is 216728178217. The next prime is 216728178241. The reversal of 216728178228 is 822871827612.

It is a super-2 number, since 2×216728178228² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5781150 + ... + 5818517.

It is an arithmetic number, because the mean of its divisors is an integer number (11773663020).

Almost surely, 2^216728178228 is an apocalyptic number.

It is an amenable number.

216728178228 is an abundant number, since it is smaller than the sum of its proper divisors (348407646732).

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

216728178228 is a wasteful number, since it uses less digits than its factorization.

216728178228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11599853 (or 11599845 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 54.

The spelling of 216728178228 in words is "two hundred sixteen billion, seven hundred twenty-eight million, one hundred seventy-eight thousand, two hundred twenty-eight".