768721 has 4 divisors (see below), whose sum is σ = 809200. Its totient is φ = 728244.

The previous prime is 768671. The next prime is 768727. The reversal of 768721 is 127867.

It is a happy number.

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 768721 - 2¹⁵ = 735953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768727) 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, 20211 + ... + 20248.

It is an arithmetic number, because the mean of its divisors is an integer number (202300).

2⁷⁶⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

768721 is a deficient number, since it is larger than the sum of its proper divisors (40479).

768721 is a wasteful number, since it uses less digits than its factorization.

768721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40478.

The product of its digits is 4704, while the sum is 31.

The square root of 768721 is about 876.7673579690. The cubic root of 768721 is about 91.6057880441.

The spelling of 768721 in words is "seven hundred sixty-eight thousand, seven hundred twenty-one".