288887221 has 8 divisors (see below), whose sum is σ = 330410304. Its totient is φ = 247427520.

The previous prime is 288887213. The next prime is 288887251. The reversal of 288887221 is 122788882.

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 288887221 - 2³ = 288887213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288887251) 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, 5635 + ... + 24688.

It is an arithmetic number, because the mean of its divisors is an integer number (41301288).

Almost surely, 2^288887221 is an apocalyptic number.

It is an amenable number.

288887221 is a deficient number, since it is larger than the sum of its proper divisors (41523083).

288887221 is a wasteful number, since it uses less digits than its factorization.

288887221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31691.

The product of its digits is 229376, while the sum is 46.

The square root of 288887221 is about 16996.6826469167. The cubic root of 288887221 is about 661.0628886816.

It can be divided in two parts, 2888 and 87221, that added together give a palindrome (90109).

The spelling of 288887221 in words is "two hundred eighty-eight million, eight hundred eighty-seven thousand, two hundred twenty-one".