216448069 has 4 divisors (see below), whose sum is σ = 219996460. Its totient is φ = 212899680.

The previous prime is 216448007. The next prime is 216448073. The reversal of 216448069 is 960844612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85803169 + 130644900 = 9263^2 + 11430^2 .

It is a cyclic number.

It is not a de Polignac number, because 216448069 - 2⁷ = 216447941 is a prime.

It is a super-2 number, since 2×216448069² = 93699533147657522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216448079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1774104 + ... + 1774225.

It is an arithmetic number, because the mean of its divisors is an integer number (54999115).

Almost surely, 2^216448069 is an apocalyptic number.

It is an amenable number.

216448069 is a deficient number, since it is larger than the sum of its proper divisors (3548391).

216448069 is an equidigital number, since it uses as much as digits as its factorization.

216448069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548390.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 216448069 is about 14712.1741765111. The cubic root of 216448069 is about 600.4145921600.

The spelling of 216448069 in words is "two hundred sixteen million, four hundred forty-eight thousand, sixty-nine".