288621 has 6 divisors (see below), whose sum is σ = 416910. Its totient is φ = 192408.

The previous prime is 288583. The next prime is 288647. The reversal of 288621 is 126882.

It can be written as a sum of positive squares in only one way, i.e., 275625 + 12996 = 525^2 + 114^2 .

It is not a de Polignac number, because 288621 - 2⁷ = 288493 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16026 + ... + 16043.

It is an arithmetic number, because the mean of its divisors is an integer number (69485).

2²⁸⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

288621 is a deficient number, since it is larger than the sum of its proper divisors (128289).

288621 is a wasteful number, since it uses less digits than its factorization.

288621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32075 (or 32072 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 288621 is about 537.2345856328. The cubic root of 288621 is about 66.0859761073.

It can be divided in two parts, 2886 and 21, that multiplied together give a palindrome (60606).

The spelling of 288621 in words is "two hundred eighty-eight thousand, six hundred twenty-one".