16216720 has 80 divisors (see below), whose sum is σ = 41997312. Its totient is φ = 5783040.

The previous prime is 16216703. The next prime is 16216723. The reversal of 16216720 is 2761261.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (16216723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31989 + ... + 32491.

Almost surely, 2^16216720 is an apocalyptic number.

16216720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16216720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20998656).

16216720 is an abundant number, since it is smaller than the sum of its proper divisors (25780592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16216720 is a wasteful number, since it uses less digits than its factorization.

16216720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 16216720 is about 4026.9988825427. The cubic root of 16216720 is about 253.1168202407.

Adding to 16216720 its reverse (2761261), we get a palindrome (18977981).

The spelling of 16216720 in words is "sixteen million, two hundred sixteen thousand, seven hundred twenty".