168907987 has 8 divisors (see below), whose sum is σ = 173324592. Its totient is φ = 164505600.

The previous prime is 168907969. The next prime is 168908009. The reversal of 168907987 is 789709861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168907987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168907927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23068 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (21665574).

Almost surely, 2^168907987 is an apocalyptic number.

168907987 is a deficient number, since it is larger than the sum of its proper divisors (4416605).

168907987 is an equidigital number, since it uses as much as digits as its factorization.

168907987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7109.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 168907987 is about 12996.4605566285. The cubic root of 168907987 is about 552.7771240681. Note that the first 3 decimals are identical.

The spelling of 168907987 in words is "one hundred sixty-eight million, nine hundred seven thousand, nine hundred eighty-seven".