721627 has 4 divisors (see below), whose sum is σ = 725560. Its totient is φ = 717696.

The previous prime is 721621. The next prime is 721631. The reversal of 721627 is 726127.

721627 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 726127 = 419 ⋅1733.

It is a cyclic number.

It is not a de Polignac number, because 721627 - 2³ = 721619 is a prime.

It is a Duffinian number.

721627 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (721621) 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, 1677 + ... + 2062.

It is an arithmetic number, because the mean of its divisors is an integer number (181390).

2⁷²¹⁶²⁷ is an apocalyptic number.

721627 is a deficient number, since it is larger than the sum of its proper divisors (3933).

721627 is a wasteful number, since it uses less digits than its factorization.

721627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932.

The product of its digits is 1176, while the sum is 25.

The square root of 721627 is about 849.4863153695. The cubic root of 721627 is about 89.6955556751.

The spelling of 721627 in words is "seven hundred twenty-one thousand, six hundred twenty-seven".