608721 has 4 divisors (see below), whose sum is σ = 811632. Its totient is φ = 405812.

The previous prime is 608701. The next prime is 608737. The reversal of 608721 is 127806.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 608721 - 2⁷ = 608593 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 608691 and 608700.

It is not an unprimeable number, because it can be changed into a prime (608701) 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, 101451 + ... + 101456.

It is an arithmetic number, because the mean of its divisors is an integer number (202908).

2⁶⁰⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

608721 is a deficient number, since it is larger than the sum of its proper divisors (202911).

608721 is a wasteful number, since it uses less digits than its factorization.

608721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202910.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 608721 is about 780.2057420963. The cubic root of 608721 is about 84.7499456148.

The spelling of 608721 in words is "six hundred eight thousand, seven hundred twenty-one".