168065680 has 20 divisors (see below), whose sum is σ = 390752892. Its totient is φ = 67226240.

The previous prime is 168065641. The next prime is 168065687. The reversal of 168065680 is 86560861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101284096 + 66781584 = 10064^2 + 8172^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (168065687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050331 + ... + 1050490.

Almost surely, 2^168065680 is an apocalyptic number.

168065680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168065680 is an abundant number, since it is smaller than the sum of its proper divisors (222687212).

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

168065680 is a wasteful number, since it uses less digits than its factorization.

168065680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100834 (or 2100828 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 168065680 is about 12964.0148102353. The cubic root of 168065680 is about 551.8567331059.

The spelling of 168065680 in words is "one hundred sixty-eight million, sixty-five thousand, six hundred eighty".