168144240 has 80 divisors (see below), whose sum is σ = 568642176. Its totient is φ = 40761600.

The previous prime is 168144227. The next prime is 168144241. The reversal of 168144240 is 42441861.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 168144198 and 168144207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168144241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29206 + ... + 34485.

Almost surely, 2^168144240 is an apocalyptic number.

168144240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168144240 is an abundant number, since it is smaller than the sum of its proper divisors (400497936).

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

168144240 is a wasteful number, since it uses less digits than its factorization.

168144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63718 (or 63712 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 168144240 is about 12967.0443818165. The cubic root of 168144240 is about 551.9427056686.

The spelling of 168144240 in words is "one hundred sixty-eight million, one hundred forty-four thousand, two hundred forty".