720778 has 8 divisors (see below), whose sum is σ = 1087200. Its totient is φ = 358380.

The previous prime is 720773. The next prime is 720779. The reversal of 720778 is 877027.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (720773) 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 3 ways as a sum of consecutive naturals, for example, 508 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (135900).

2⁷²⁰⁷⁷⁸ is an apocalyptic number.

720778 is a deficient number, since it is larger than the sum of its proper divisors (366422).

720778 is a wasteful number, since it uses less digits than its factorization.

720778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 720778 is about 848.9864545445. The cubic root of 720778 is about 89.6603660223.

The spelling of 720778 in words is "seven hundred twenty thousand, seven hundred seventy-eight".