87211539856 has 135 divisors (see below), whose sum is σ = 201350114721. Its totient is φ = 36486882432.

The previous prime is 87211539829. The next prime is 87211539869. The reversal of 87211539856 is 65893511278.

The square root of 87211539856 is 295316.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 62870547600 + 24340992256 = 250740^2 + 156016^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87211539797 and 87211539806.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 438248845 + ... + 438249043.

Almost surely, 2^87211539856 is an apocalyptic number.

87211539856 is the 295316-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87211539856

87211539856 is an abundant number, since it is smaller than the sum of its proper divisors (114138574865).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87211539856 is an equidigital number, since it uses as much as digits as its factorization.

87211539856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 261 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 55.

The spelling of 87211539856 in words is "eighty-seven billion, two hundred eleven million, five hundred thirty-nine thousand, eight hundred fifty-six".