80705009 has 12 divisors (see below), whose sum is σ = 102416688. Its totient is φ = 62886600.

The previous prime is 80705003. The next prime is 80705011. The reversal of 80705009 is 90050708.

It is a happy number.

It is not a de Polignac number, because 80705009 - 2¹⁶ = 80639473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80705003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74327 + ... + 75404.

It is an arithmetic number, because the mean of its divisors is an integer number (8534724).

Almost surely, 2^80705009 is an apocalyptic number.

It is an amenable number.

80705009 is a deficient number, since it is larger than the sum of its proper divisors (21711679).

80705009 is a wasteful number, since it uses less digits than its factorization.

80705009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149756 (or 149749 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 80705009 is about 8983.5966628072. The cubic root of 80705009 is about 432.1489844647.

The spelling of 80705009 in words is "eighty million, seven hundred five thousand, nine".