87181029 has 20 divisors (see below), whose sum is σ = 140253036. Its totient is φ = 53649216.

The previous prime is 87181013. The next prime is 87181033. The reversal of 87181029 is 92018178.

It can be written as a sum of positive squares in 2 ways, for example, as 44957025 + 42224004 = 6705^2 + 6498^2 .

It is not a de Polignac number, because 87181029 - 2⁴ = 87181013 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 87180984 and 87181002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87181069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40344 + ... + 42449.

Almost surely, 2^87181029 is an apocalyptic number.

It is an amenable number.

87181029 is a deficient number, since it is larger than the sum of its proper divisors (53072007).

87181029 is a wasteful number, since it uses less digits than its factorization.

87181029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82818 (or 82809 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 87181029 is about 9337.0781832434. The cubic root of 87181029 is about 443.4118856920.

The spelling of 87181029 in words is "eighty-seven million, one hundred eighty-one thousand, twenty-nine".