87173772 has 48 divisors (see below), whose sum is σ = 242575872. Its totient is φ = 23823360.

The previous prime is 87173759. The next prime is 87173783. The reversal of 87173772 is 27737178.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20629 + ... + 24492.

It is an arithmetic number, because the mean of its divisors is an integer number (5053664).

Almost surely, 2^87173772 is an apocalyptic number.

It is an amenable number.

87173772 is an abundant number, since it is smaller than the sum of its proper divisors (155402100).

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

87173772 is a wasteful number, since it uses less digits than its factorization.

87173772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45158 (or 45156 counting only the distinct ones).

The product of its digits is 115248, while the sum is 42.

The square root of 87173772 is about 9336.6895632231. The cubic root of 87173772 is about 443.3995820621.

The spelling of 87173772 in words is "eighty-seven million, one hundred seventy-three thousand, seven hundred seventy-two".