216220736 has 14 divisors (see below), whose sum is σ = 429063150. Its totient is φ = 108110336.

The previous prime is 216220729. The next prime is 216220747. The reversal of 216220736 is 637022612.

It can be written as a sum of positive squares in only one way, i.e., 211993600 + 4227136 = 14560^2 + 2056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216220699 and 216220708.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1689161 + ... + 1689288.

Almost surely, 2^216220736 is an apocalyptic number.

It is an amenable number.

216220736 is a deficient number, since it is larger than the sum of its proper divisors (212842414).

216220736 is an equidigital number, since it uses as much as digits as its factorization.

216220736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378461 (or 3378451 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 216220736 is about 14704.4461303376. The cubic root of 216220736 is about 600.2043156025.

The spelling of 216220736 in words is "two hundred sixteen million, two hundred twenty thousand, seven hundred thirty-six".