720770 has 8 divisors (see below), whose sum is σ = 1297404. Its totient is φ = 288304.

The previous prime is 720767. The next prime is 720773. The reversal of 720770 is 77027.

It is an interprime number because it is at equal distance from previous prime (720767) and next prime (720773).

It can be written as a sum of positive squares in 2 ways, for example, as 638401 + 82369 = 799^2 + 287^2 .

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

It is not an unprimeable number, because it can be changed into a prime (720773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36029 + ... + 36048.

2⁷²⁰⁷⁷⁰ is an apocalyptic number.

720770 is a deficient number, since it is larger than the sum of its proper divisors (576634).

720770 is a wasteful number, since it uses less digits than its factorization.

720770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72084.

The product of its (nonzero) digits is 686, while the sum is 23.

The square root of 720770 is about 848.9817430310. The cubic root of 720770 is about 89.6600343041.

Adding to 720770 its reverse (77027), we get a palindrome (797797).

The spelling of 720770 in words is "seven hundred twenty thousand, seven hundred seventy", and thus it is an iban number.