721675 has 6 divisors (see below), whose sum is σ = 894908. Its totient is φ = 577320.

The previous prime is 721663. The next prime is 721687. The reversal of 721675 is 576127.

721675 is nontrivially palindromic in base 16.

It is an interprime number because it is at equal distance from previous prime (721663) and next prime (721687).

It is not a de Polignac number, because 721675 - 2⁷ = 721547 is a prime.

It is a Duffinian number.

721675 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14409 + ... + 14458.

2⁷²¹⁶⁷⁵ is an apocalyptic number.

721675 is a deficient number, since it is larger than the sum of its proper divisors (173233).

721675 is a wasteful number, since it uses less digits than its factorization.

721675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28877 (or 28872 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 721675 is about 849.5145672677. The cubic root of 721675 is about 89.6975443715.

The spelling of 721675 in words is "seven hundred twenty-one thousand, six hundred seventy-five".