720678 has 16 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 205896.

The previous prime is 720677. The next prime is 720683. The reversal of 720678 is 876027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8538 + ... + 8621.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2⁷²⁰⁶⁷⁸ is an apocalyptic number.

720678 is an abundant number, since it is smaller than the sum of its proper divisors (926682).

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

720678 is a wasteful number, since it uses less digits than its factorization.

720678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17171.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 720678 is about 848.9275587469. The cubic root of 720678 is about 89.6562193682.

The spelling of 720678 in words is "seven hundred twenty thousand, six hundred seventy-eight".