288507661 has 8 divisors (see below), whose sum is σ = 311260320. Its totient is φ = 265834992.

The previous prime is 288507641. The next prime is 288507677. The reversal of 288507661 is 166705882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 288507661 - 2¹⁷ = 288376589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288507641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12391 + ... + 27028.

It is an arithmetic number, because the mean of its divisors is an integer number (38907540).

Almost surely, 2^288507661 is an apocalyptic number.

It is an amenable number.

288507661 is a deficient number, since it is larger than the sum of its proper divisors (22752659).

288507661 is a wasteful number, since it uses less digits than its factorization.

288507661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39995.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 288507661 is about 16985.5132686652. The cubic root of 288507661 is about 660.7732450872.

The spelling of 288507661 in words is "two hundred eighty-eight million, five hundred seven thousand, six hundred sixty-one".