80644689 has 12 divisors (see below), whose sum is σ = 116580100. Its totient is φ = 53720064.

The previous prime is 80644673. The next prime is 80644699. The reversal of 80644689 is 98644608.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51840000 + 28804689 = 7200^2 + 5367^2 .

It is not a de Polignac number, because 80644689 - 2⁴ = 80644673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80644649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11697 + ... + 17265.

Almost surely, 2^80644689 is an apocalyptic number.

It is an amenable number.

80644689 is a deficient number, since it is larger than the sum of its proper divisors (35935411).

80644689 is a wasteful number, since it uses less digits than its factorization.

80644689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7184 (or 7181 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 80644689 is about 8980.2388052880. The cubic root of 80644689 is about 432.0412929922.

The spelling of 80644689 in words is "eighty million, six hundred forty-four thousand, six hundred eighty-nine".