288621855 has 24 divisors (see below), whose sum is σ = 501141888. Its totient is φ = 153665856.

The previous prime is 288621829. The next prime is 288621857. The reversal of 288621855 is 558126882.

It is not a de Polignac number, because 288621855 - 2¹⁵ = 288589087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 288621855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288621857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22354 + ... + 32816.

It is an arithmetic number, because the mean of its divisors is an integer number (20880912).

Almost surely, 2^288621855 is an apocalyptic number.

288621855 is a deficient number, since it is larger than the sum of its proper divisors (212520033).

288621855 is a wasteful number, since it uses less digits than its factorization.

288621855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11087 (or 11084 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The square root of 288621855 is about 16988.8744477084. The cubic root of 288621855 is about 660.8604136409.

The spelling of 288621855 in words is "two hundred eighty-eight million, six hundred twenty-one thousand, eight hundred fifty-five".