720278 has 12 divisors (see below), whose sum is σ = 1170468. Its totient is φ = 332280.

The previous prime is 720257. The next prime is 720281. The reversal of 720278 is 872027.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720278.

It is an unprimeable number.

720278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 728 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (97539).

2⁷²⁰²⁷⁸ is an apocalyptic number.

720278 is a deficient number, since it is larger than the sum of its proper divisors (450190).

720278 is a wasteful number, since it uses less digits than its factorization.

720278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 720278 is about 848.6919346854. The cubic root of 720278 is about 89.6396289146.

The spelling of 720278 in words is "seven hundred twenty thousand, two hundred seventy-eight".