87181092 has 36 divisors (see below), whose sum is σ = 221867100. Its totient is φ = 28863552.

The previous prime is 87181091. The next prime is 87181103. The reversal of 87181092 is 29018178.

It can be written as a sum of positive squares in 2 ways, for example, as 33246756 + 53934336 = 5766^2 + 7344^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (87181091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2763 + ... + 13490.

It is an arithmetic number, because the mean of its divisors is an integer number (6162975).

Almost surely, 2^87181092 is an apocalyptic number.

It is an amenable number.

87181092 is an abundant number, since it is smaller than the sum of its proper divisors (134686008).

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

87181092 is a wasteful number, since it uses less digits than its factorization.

87181092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16412 (or 16407 counting only the distinct ones).

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

The square root of 87181092 is about 9337.0815568892. The cubic root of 87181092 is about 443.4119925002.

The spelling of 87181092 in words is "eighty-seven million, one hundred eighty-one thousand, ninety-two".