87168921 has 8 divisors (see below), whose sum is σ = 132828864. Its totient is φ = 49810800.

The previous prime is 87168871. The next prime is 87168937. The reversal of 87168921 is 12986178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87168921 - 2⁷ = 87168793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87168971) 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 7 ways as a sum of consecutive naturals, for example, 2075430 + ... + 2075471.

It is an arithmetic number, because the mean of its divisors is an integer number (16603608).

Almost surely, 2^87168921 is an apocalyptic number.

It is an amenable number.

87168921 is a deficient number, since it is larger than the sum of its proper divisors (45659943).

87168921 is a wasteful number, since it uses less digits than its factorization.

87168921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150911.

The product of its digits is 48384, while the sum is 42.

The square root of 87168921 is about 9336.4297780254. The cubic root of 87168921 is about 443.3913572210.

The spelling of 87168921 in words is "eighty-seven million, one hundred sixty-eight thousand, nine hundred twenty-one".