87811128 has 40 divisors (see below), whose sum is σ = 245954280. Its totient is φ = 29270160.

The previous prime is 87811123. The next prime is 87811151. The reversal of 87811128 is 82111878.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 87811092 and 87811101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87811123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 67108 + ... + 68403.

It is an arithmetic number, because the mean of its divisors is an integer number (6148857).

Almost surely, 2^87811128 is an apocalyptic number.

It is an amenable number.

87811128 is an abundant number, since it is smaller than the sum of its proper divisors (158143152).

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

87811128 is a wasteful number, since it uses less digits than its factorization.

87811128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135529 (or 135516 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 87811128 is about 9370.7592008332. The cubic root of 87811128 is about 444.4775723270.

The spelling of 87811128 in words is "eighty-seven million, eight hundred eleven thousand, one hundred twenty-eight".