68208140 has 96 divisors (see below), whose sum is σ = 192374784. Its totient is φ = 19618560.

The previous prime is 68208103. The next prime is 68208149. The reversal of 68208140 is 4180286.

It is not an unprimeable number, because it can be changed into a prime (68208149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18317 + ... + 21723.

It is an arithmetic number, because the mean of its divisors is an integer number (2003904).

Almost surely, 2^68208140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68208140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96187392).

68208140 is an abundant number, since it is smaller than the sum of its proper divisors (124166644).

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

68208140 is a wasteful number, since it uses less digits than its factorization.

68208140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447 (or 3445 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 68208140 is about 8258.8219498909. The cubic root of 68208140 is about 408.5815348815.

The spelling of 68208140 in words is "sixty-eight million, two hundred eight thousand, one hundred forty".