168804405 has 80 divisors (see below), whose sum is σ = 377334144. Its totient is φ = 70139520.

The previous prime is 168804403. The next prime is 168804409. The reversal of 168804405 is 504408861.

It is not a de Polignac number, because 168804405 - 2¹ = 168804403 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168804405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168804403) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 28479 + ... + 33891.

Almost surely, 2^168804405 is an apocalyptic number.

168804405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168804405 is an abundant number, since it is smaller than the sum of its proper divisors (208529739).

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

168804405 is a wasteful number, since it uses less digits than its factorization.

168804405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5448 (or 5439 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 168804405 is about 12992.4749374397. The cubic root of 168804405 is about 552.6641050029.

The spelling of 168804405 in words is "one hundred sixty-eight million, eight hundred four thousand, four hundred five".