87820539 has 8 divisors (see below), whose sum is σ = 118743552. Its totient is φ = 57722280.

The previous prime is 87820529. The next prime is 87820547. The reversal of 87820539 is 93502878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87820539 - 2⁹ = 87820027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87820539.

It is not an unprimeable number, because it can be changed into a prime (87820529) 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, 205939 + ... + 206364.

It is an arithmetic number, because the mean of its divisors is an integer number (14842944).

Almost surely, 2^87820539 is an apocalyptic number.

87820539 is a deficient number, since it is larger than the sum of its proper divisors (30923013).

87820539 is a wasteful number, since it uses less digits than its factorization.

87820539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412377.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 87820539 is about 9371.2613345270. The cubic root of 87820539 is about 444.4934504550.

The spelling of 87820539 in words is "eighty-seven million, eight hundred twenty thousand, five hundred thirty-nine".