721270 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 255840.

The previous prime is 721267. The next prime is 721283. The reversal of 721270 is 72127.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8649 + ... + 8731.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁷²¹²⁷⁰ is an apocalyptic number.

721270 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

721270 is a wasteful number, since it uses less digits than its factorization.

721270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 721270 is about 849.2761623877. The cubic root of 721270 is about 89.6807619773.

Adding to 721270 its reverse (72127), we get a palindrome (793397).

The spelling of 721270 in words is "seven hundred twenty-one thousand, two hundred seventy", and thus it is an iban number.