288908261 has 8 divisors (see below), whose sum is σ = 294498264. Its totient is φ = 283345920.

The previous prime is 288908233. The next prime is 288908287. The reversal of 288908261 is 162809882.

It can be written as a sum of positive squares in 4 ways, for example, as 112225 + 288796036 = 335^2 + 16994^2 .

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 288908261 - 2⁶ = 288908197 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 (288908161) 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, 14825 + ... + 28241.

It is an arithmetic number, because the mean of its divisors is an integer number (36812283).

Almost surely, 2^288908261 is an apocalyptic number.

It is an amenable number.

288908261 is a deficient number, since it is larger than the sum of its proper divisors (5590003).

288908261 is a wasteful number, since it uses less digits than its factorization.

288908261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13831.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 288908261 is about 16997.3015799567. The cubic root of 288908261 is about 661.0789369576.

The spelling of 288908261 in words is "two hundred eighty-eight million, nine hundred eight thousand, two hundred sixty-one".