720630 has 64 divisors (see below), whose sum is σ = 2047680. Its totient is φ = 179712.

The previous prime is 720619. The next prime is 720653. The reversal of 720630 is 36027.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4512 + ... + 4668.

It is an arithmetic number, because the mean of its divisors is an integer number (31995).

2⁷²⁰⁶³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023840).

720630 is an abundant number, since it is smaller than the sum of its proper divisors (1327050).

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

720630 is a wasteful number, since it uses less digits than its factorization.

720630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 720630 is about 848.8992873127. The cubic root of 720630 is about 89.6542288379.

Adding to 720630 its reverse (36027), we get a palindrome (756657).

The spelling of 720630 in words is "seven hundred twenty thousand, six hundred thirty".