210720 has 48 divisors (see below), whose sum is σ = 665280. Its totient is φ = 56064.

The previous prime is 210719. The next prime is 210731. The reversal of 210720 is 27012.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210696 and 210705.

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, 261 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2²¹⁰⁷²⁰ is an apocalyptic number.

210720 is a gapful number since it is divisible by the number (20) 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 210720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332640).

210720 is an abundant number, since it is smaller than the sum of its proper divisors (454560).

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

210720 is a wasteful number, since it uses less digits than its factorization.

210720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 210720 is about 459.0424816942. The cubic root of 210720 is about 59.5070725769.

Adding to 210720 its reverse (27012), we get a palindrome (237732).

The spelling of 210720 in words is "two hundred ten thousand, seven hundred twenty", and thus it is an iban number.