720871 has 4 divisors (see below), whose sum is σ = 740392. Its totient is φ = 701352.

The previous prime is 720869. The next prime is 720877. The reversal of 720871 is 178027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178027 = 53 ⋅3359.

It is a cyclic number.

It is not a de Polignac number, because 720871 - 2¹ = 720869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9705 + ... + 9778.

It is an arithmetic number, because the mean of its divisors is an integer number (185098).

2⁷²⁰⁸⁷¹ is an apocalyptic number.

720871 is a deficient number, since it is larger than the sum of its proper divisors (19521).

720871 is a wasteful number, since it uses less digits than its factorization.

720871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 720871 is about 849.0412239697. The cubic root of 720871 is about 89.6642220665.

Adding to 720871 its reverse (178027), we get a palindrome (898898).

The spelling of 720871 in words is "seven hundred twenty thousand, eight hundred seventy-one".