721695 has 16 divisors (see below), whose sum is σ = 1243872. Its totient is φ = 355200.

The previous prime is 721687. The next prime is 721697. The reversal of 721695 is 596127.

721695 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721695 - 2³ = 721687 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721695.

It is not an unprimeable number, because it can be changed into a prime (721697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656 + ... + 2045.

It is an arithmetic number, because the mean of its divisors is an integer number (77742).

2⁷²¹⁶⁹⁵ is an apocalyptic number.

721695 is a deficient number, since it is larger than the sum of its proper divisors (522177).

721695 is a wasteful number, since it uses less digits than its factorization.

721695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

The product of its digits is 3780, while the sum is 30.

The square root of 721695 is about 849.5263386146. The cubic root of 721695 is about 89.6983729691.

The spelling of 721695 in words is "seven hundred twenty-one thousand, six hundred ninety-five".