768644 has 6 divisors (see below), whose sum is σ = 1345134. Its totient is φ = 384320.

The previous prime is 768643. The next prime is 768653. The reversal of 768644 is 446867.

768644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 743044 + 25600 = 862^2 + 160^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (768641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96077 + ... + 96084.

It is an arithmetic number, because the mean of its divisors is an integer number (224189).

768644 is a Friedman number, since it can be written as 8^6*4-6^7+4, using all its digits and the basic arithmetic operations.

2⁷⁶⁸⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

768644 is a deficient number, since it is larger than the sum of its proper divisors (576490).

768644 is a wasteful number, since it uses less digits than its factorization.

768644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192165 (or 192163 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 768644 is about 876.7234455631. The cubic root of 768644 is about 91.6027293352.

The spelling of 768644 in words is "seven hundred sixty-eight thousand, six hundred forty-four".