168425640 has 96 divisors (see below), whose sum is σ = 550368000. Its totient is φ = 44668800.

The previous prime is 168425629. The next prime is 168425641. The reversal of 168425640 is 46524861.

168425640 is a `hidden beast` number, since 1 + 6 + 8 + 4 + 2 + 5 + 640 = 666.

It is a super-3 number, since 3×168425640³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 168425595 and 168425604.

It is not an unprimeable number, because it can be changed into a prime (168425641) 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, 70465 + ... + 72815.

It is an arithmetic number, because the mean of its divisors is an integer number (5733000).

Almost surely, 2^168425640 is an apocalyptic number.

168425640 is a gapful number since it is divisible by the number (10) 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 168425640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275184000).

168425640 is an abundant number, since it is smaller than the sum of its proper divisors (381942360).

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

168425640 is a wasteful number, since it uses less digits than its factorization.

168425640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567 (or 2560 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 168425640 is about 12977.8904294959. The cubic root of 168425640 is about 552.2504377161.

The spelling of 168425640 in words is "one hundred sixty-eight million, four hundred twenty-five thousand, six hundred forty".