722705 has 4 divisors (see below), whose sum is σ = 867252. Its totient is φ = 578160.

The previous prime is 722669. The next prime is 722713. The reversal of 722705 is 507227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507227 = 7 ⋅72461.

It can be written as a sum of positive squares in 2 ways, for example, as 529984 + 192721 = 728^2 + 439^2 .

It is not a de Polignac number, because 722705 - 2¹⁸ = 460561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72266 + ... + 72275.

It is an arithmetic number, because the mean of its divisors is an integer number (216813).

2⁷²²⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

722705 is a deficient number, since it is larger than the sum of its proper divisors (144547).

722705 is a wasteful number, since it uses less digits than its factorization.

722705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144546.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 722705 is about 850.1205796827. The cubic root of 722705 is about 89.7401972518.

The spelling of 722705 in words is "seven hundred twenty-two thousand, seven hundred five".