168090804 has 72 divisors (see below), whose sum is σ = 501283328. Its totient is φ = 46474560.

The previous prime is 168090803. The next prime is 168090821. The reversal of 168090804 is 408090861.

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 (168090803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2947 + ... + 18570.

Almost surely, 2^168090804 is an apocalyptic number.

168090804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168090804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250641664).

168090804 is an abundant number, since it is smaller than the sum of its proper divisors (333192524).

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

168090804 is a wasteful number, since it uses less digits than its factorization.

168090804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21565 (or 21560 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 168090804 is about 12964.9837639698. The cubic root of 168090804 is about 551.8842306051.

The spelling of 168090804 in words is "one hundred sixty-eight million, ninety thousand, eight hundred four".