216742228 has 24 divisors (see below), whose sum is σ = 387315432. Its totient is φ = 106089984.

The previous prime is 216742219. The next prime is 216742237. The reversal of 216742228 is 822247612.

It is an interprime number because it is at equal distance from previous prime (216742219) and next prime (216742237).

It can be written as a sum of positive squares in 4 ways, for example, as 2471184 + 214271044 = 1572^2 + 14638^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216742193 and 216742202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129976 + ... + 131632.

It is an arithmetic number, because the mean of its divisors is an integer number (16138143).

Almost surely, 2^216742228 is an apocalyptic number.

It is an amenable number.

216742228 is a deficient number, since it is larger than the sum of its proper divisors (170573204).

216742228 is a wasteful number, since it uses less digits than its factorization.

216742228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2329 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 216742228 is about 14722.1679110109. The cubic root of 216742228 is about 600.6864624641.

The spelling of 216742228 in words is "two hundred sixteen million, seven hundred forty-two thousand, two hundred twenty-eight".