87133128 has 16 divisors (see below), whose sum is σ = 217832880. Its totient is φ = 29044368.

The previous prime is 87133127. The next prime is 87133133. The reversal of 87133128 is 82133178.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (87133127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1815250 + ... + 1815297.

It is an arithmetic number, because the mean of its divisors is an integer number (13614555).

Almost surely, 2^87133128 is an apocalyptic number.

It is an amenable number.

87133128 is an abundant number, since it is smaller than the sum of its proper divisors (130699752).

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

87133128 is a wasteful number, since it uses less digits than its factorization.

87133128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630556 (or 3630552 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 87133128 is about 9334.5127350066. The cubic root of 87133128 is about 443.3306609722.

The spelling of 87133128 in words is "eighty-seven million, one hundred thirty-three thousand, one hundred twenty-eight".