640176009 has 32 divisors (see below), whose sum is σ = 984711168. Its totient is φ = 366288000.

The previous prime is 640175999. The next prime is 640176011. The reversal of 640176009 is 900671046.

It is a happy number.

It is not a de Polignac number, because 640176009 - 2¹⁹ = 639651721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (640176059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34312 + ... + 49574.

It is an arithmetic number, because the mean of its divisors is an integer number (30772224).

Almost surely, 2^640176009 is an apocalyptic number.

It is an amenable number.

640176009 is a deficient number, since it is larger than the sum of its proper divisors (344535159).

640176009 is a wasteful number, since it uses less digits than its factorization.

640176009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15349.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 640176009 is about 25301.6997255125. The cubic root of 640176009 is about 861.8528687500.

The spelling of 640176009 in words is "six hundred forty million, one hundred seventy-six thousand, nine".