288640109 has 4 divisors (see below), whose sum is σ = 289667580. Its totient is φ = 287612640.

The previous prime is 288640069. The next prime is 288640117. The reversal of 288640109 is 901046882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 217710025 + 70930084 = 14755^2 + 8422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-288640109 is a prime.

It is a super-2 number, since 2×288640109² = 166626225047063762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288640129) 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 3 ways as a sum of consecutive naturals, for example, 513314 + ... + 513875.

It is an arithmetic number, because the mean of its divisors is an integer number (72416895).

Almost surely, 2^288640109 is an apocalyptic number.

It is an amenable number.

288640109 is a deficient number, since it is larger than the sum of its proper divisors (1027471).

288640109 is a wasteful number, since it uses less digits than its factorization.

288640109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027470.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 288640109 is about 16989.4116731569. The cubic root of 288640109 is about 660.8743454707.

The spelling of 288640109 in words is "two hundred eighty-eight million, six hundred forty thousand, one hundred nine".