288278391 has 8 divisors (see below), whose sum is σ = 385386880. Its totient is φ = 191677752.

The previous prime is 288278371. The next prime is 288278411. The reversal of 288278391 is 193872882.

It is an interprime number because it is at equal distance from previous prime (288278371) and next prime (288278411).

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

It is not a de Polignac number, because 288278391 - 2⁹ = 288277879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 288278391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288278311) 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 7 ways as a sum of consecutive naturals, for example, 125635 + ... + 127908.

It is an arithmetic number, because the mean of its divisors is an integer number (48173360).

Almost surely, 2^288278391 is an apocalyptic number.

288278391 is a deficient number, since it is larger than the sum of its proper divisors (97108489).

288278391 is a wasteful number, since it uses less digits than its factorization.

288278391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253925.

The product of its digits is 387072, while the sum is 48.

The square root of 288278391 is about 16978.7629408034. The cubic root of 288278391 is about 660.5981652423.

The spelling of 288278391 in words is "two hundred eighty-eight million, two hundred seventy-eight thousand, three hundred ninety-one".