720855 has 24 divisors (see below), whose sum is σ = 1271088. Its totient is φ = 377856.

The previous prime is 720847. The next prime is 720857. The reversal of 720855 is 558027.

It is a happy number.

It is not a de Polignac number, because 720855 - 2³ = 720847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3639 + ... + 3831.

It is an arithmetic number, because the mean of its divisors is an integer number (52962).

2⁷²⁰⁸⁵⁵ is an apocalyptic number.

720855 is a deficient number, since it is larger than the sum of its proper divisors (550233).

720855 is a wasteful number, since it uses less digits than its factorization.

720855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 720855 is about 849.0318015245. The cubic root of 720855 is about 89.6635586847.

The spelling of 720855 in words is "seven hundred twenty thousand, eight hundred fifty-five".