87331647 has 16 divisors (see below), whose sum is σ = 125877248. Its totient is φ = 53537760.

The previous prime is 87331637. The next prime is 87331649. The reversal of 87331647 is 74613378.

87331647 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 87331647 - 2¹⁰ = 87330623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87331649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6438 + ... + 14700.

It is an arithmetic number, because the mean of its divisors is an integer number (7867328).

Almost surely, 2^87331647 is an apocalyptic number.

87331647 is a deficient number, since it is larger than the sum of its proper divisors (38545601).

87331647 is a wasteful number, since it uses less digits than its factorization.

87331647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8550.

The product of its digits is 84672, while the sum is 39.

The square root of 87331647 is about 9345.1402878716. The cubic root of 87331647 is about 443.6670917778.

It can be divided in two parts, 87331 and 647, that added together give a palindrome (87978).

The spelling of 87331647 in words is "eighty-seven million, three hundred thirty-one thousand, six hundred forty-seven".