720819 has 20 divisors (see below), whose sum is σ = 1176120. Its totient is φ = 436320.

The previous prime is 720793. The next prime is 720829. The reversal of 720819 is 918027.

It is not a de Polignac number, because 720819 - 2¹⁶ = 655283 is a prime.

It is a super-2 number, since 2×720819² = 1039160061522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 720792 and 720801.

It is not an unprimeable number, because it can be changed into a prime (720829) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 487 + ... + 1295.

It is an arithmetic number, because the mean of its divisors is an integer number (58806).

2⁷²⁰⁸¹⁹ is an apocalyptic number.

720819 is a deficient number, since it is larger than the sum of its proper divisors (455301).

720819 is a wasteful number, since it uses less digits than its factorization.

720819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 720819 is about 849.0106006405. The cubic root of 720819 is about 89.6620660397.

It can be divided in two parts, 7208 and 19, that added together give a palindrome (7227).

The spelling of 720819 in words is "seven hundred twenty thousand, eight hundred nineteen".