720712 has 8 divisors (see below), whose sum is σ = 1351350. Its totient is φ = 360352.

The previous prime is 720703. The next prime is 720743. The reversal of 720712 is 217027.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 133956 = 766^2 + 366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 720712.

It is an unprimeable number.

720712 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45037 + ... + 45052.

2⁷²⁰⁷¹² is an apocalyptic number.

It is an amenable number.

720712 is a deficient number, since it is larger than the sum of its proper divisors (630638).

720712 is a wasteful number, since it uses less digits than its factorization.

720712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90095 (or 90091 counting only the distinct ones).

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

The square root of 720712 is about 848.9475837765. The cubic root of 720712 is about 89.6576292736.

Adding to 720712 its reverse (217027), we get a palindrome (937739).

The spelling of 720712 in words is "seven hundred twenty thousand, seven hundred twelve", and thus it is an iban number.