720555 has 24 divisors (see below), whose sum is σ = 1270416. Its totient is φ = 348480.

The previous prime is 720547. The next prime is 720569. The reversal of 720555 is 555027.

It is not a de Polignac number, because 720555 - 2³ = 720547 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720555.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1617 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (52934).

2⁷²⁰⁵⁵⁵ is an apocalyptic number.

720555 is a deficient number, since it is larger than the sum of its proper divisors (549861).

720555 is a wasteful number, since it uses less digits than its factorization.

720555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 24.

The square root of 720555 is about 848.8551113117. The cubic root of 720555 is about 89.6511184574.

It can be divided in two parts, 7205 and 55, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 720555 in words is "seven hundred twenty thousand, five hundred fifty-five".