87281172 has 72 divisors (see below), whose sum is σ = 248763200. Its totient is φ = 26444880.

The previous prime is 87281149. The next prime is 87281177. The reversal of 87281172 is 27118278.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87281177) 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 23 ways as a sum of consecutive naturals, for example, 9729 + ... + 16407.

Almost surely, 2^87281172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87281172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124381600).

87281172 is an abundant number, since it is smaller than the sum of its proper divisors (161482028).

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

87281172 is a wasteful number, since it uses less digits than its factorization.

87281172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6714 (or 6695 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 87281172 is about 9342.4392960297. The cubic root of 87281172 is about 443.5816000041.

The spelling of 87281172 in words is "eighty-seven million, two hundred eighty-one thousand, one hundred seventy-two".