87439539 has 16 divisors (see below), whose sum is σ = 133879680. Its totient is φ = 50204160.

The previous prime is 87439529. The next prime is 87439543. The reversal of 87439539 is 93593478.

It is not a de Polignac number, because 87439539 - 2¹⁷ = 87308467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87439519) 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, 69102 + ... + 70355.

It is an arithmetic number, because the mean of its divisors is an integer number (8367480).

Almost surely, 2^87439539 is an apocalyptic number.

87439539 is a deficient number, since it is larger than the sum of its proper divisors (46440141).

87439539 is a wasteful number, since it uses less digits than its factorization.

87439539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139490.

The product of its digits is 816480, while the sum is 48.

The square root of 87439539 is about 9350.9111320769. The cubic root of 87439539 is about 443.8497229029.

It can be divided in two parts, 87439 and 539, that added together give a palindrome (87978).

The spelling of 87439539 in words is "eighty-seven million, four hundred thirty-nine thousand, five hundred thirty-nine".