87156521828 has 24 divisors (see below), whose sum is σ = 156206986488. Its totient is φ = 42534475776.

The previous prime is 87156521813. The next prime is 87156521833. The reversal of 87156521828 is 82812565178.

It can be written as a sum of positive squares in 4 ways, for example, as 10445248804 + 76711273024 = 102202^2 + 276968^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 87156521828.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1024151 + ... + 1105982.

It is an arithmetic number, because the mean of its divisors is an integer number (6508624437).

Almost surely, 2^87156521828 is an apocalyptic number.

It is an amenable number.

87156521828 is a deficient number, since it is larger than the sum of its proper divisors (69050464660).

87156521828 is a wasteful number, since it uses less digits than its factorization.

87156521828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130383 (or 2130381 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 53.

The spelling of 87156521828 in words is "eighty-seven billion, one hundred fifty-six million, five hundred twenty-one thousand, eight hundred twenty-eight".