87128500 has 24 divisors (see below), whose sum is σ = 190289736. Its totient is φ = 34851200.

The previous prime is 87128473. The next prime is 87128501. The reversal of 87128500 is 582178.

It can be written as a sum of positive squares in 4 ways, for example, as 898704 + 86229796 = 948^2 + 9286^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87128501) 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, 86629 + ... + 87628.

It is an arithmetic number, because the mean of its divisors is an integer number (7928739).

Almost surely, 2^87128500 is an apocalyptic number.

It is an amenable number.

87128500 is an abundant number, since it is smaller than the sum of its proper divisors (103161236).

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

87128500 is a wasteful number, since it uses less digits than its factorization.

87128500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174276 (or 174264 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 87128500 is about 9334.2648344688. The cubic root of 87128500 is about 443.3228117929.

The spelling of 87128500 in words is "eighty-seven million, one hundred twenty-eight thousand, five hundred".