87181172 has 12 divisors (see below), whose sum is σ = 164303076. Its totient is φ = 40237440.

The previous prime is 87181153. The next prime is 87181189. The reversal of 87181172 is 27118178.

It can be written as a sum of positive squares in 2 ways, for example, as 23755876 + 63425296 = 4874^2 + 7964^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 838229 + ... + 838332.

It is an arithmetic number, because the mean of its divisors is an integer number (13691923).

Almost surely, 2^87181172 is an apocalyptic number.

It is an amenable number.

87181172 is a deficient number, since it is larger than the sum of its proper divisors (77121904).

87181172 is a wasteful number, since it uses less digits than its factorization.

87181172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676578 (or 1676576 counting only the distinct ones).

The product of its digits is 6272, while the sum is 35.

The square root of 87181172 is about 9337.0858408820. The cubic root of 87181172 is about 443.4121281296.

The spelling of 87181172 in words is "eighty-seven million, one hundred eighty-one thousand, one hundred seventy-two".