216726428 has 12 divisors (see below), whose sum is σ = 380290680. Its totient is φ = 108071952.

The previous prime is 216726409. The next prime is 216726431. The reversal of 216726428 is 824627612.

It is a junction number, because it is equal to n+sod(n) for n = 216726391 and 216726400.

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, 71138 + ... + 74121.

It is an arithmetic number, because the mean of its divisors is an integer number (31690890).

Almost surely, 2^216726428 is an apocalyptic number.

It is an amenable number.

216726428 is a deficient number, since it is larger than the sum of its proper divisors (163564252).

216726428 is a wasteful number, since it uses less digits than its factorization.

216726428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145636 (or 145634 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 216726428 is about 14721.6312954781. The cubic root of 216726428 is about 600.6718658981.

The spelling of 216726428 in words is "two hundred sixteen million, seven hundred twenty-six thousand, four hundred twenty-eight".