216720073 has 8 divisors (see below), whose sum is σ = 220514400. Its totient is φ = 212956128.

The previous prime is 216720067. The next prime is 216720089. The reversal of 216720073 is 370027612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216720073 - 2⁹ = 216719561 is a prime.

It is a super-2 number, since 2×216720073² = 93935180082250658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216720173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7038 + ... + 21976.

It is an arithmetic number, because the mean of its divisors is an integer number (27564300).

Almost surely, 2^216720073 is an apocalyptic number.

It is an amenable number.

216720073 is a deficient number, since it is larger than the sum of its proper divisors (3794327).

216720073 is a wasteful number, since it uses less digits than its factorization.

216720073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15191.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 216720073 is about 14721.4154550437. The cubic root of 216720073 is about 600.6659947374.

Adding to 216720073 its reverse (370027612), we get a palindrome (586747685).

The spelling of 216720073 in words is "two hundred sixteen million, seven hundred twenty thousand, seventy-three".