68388240 has 80 divisors (see below), whose sum is σ = 215218368. Its totient is φ = 17960448.

The previous prime is 68388227. The next prime is 68388283. The reversal of 68388240 is 4288386.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13954 + ... + 18206.

Almost surely, 2^68388240 is an apocalyptic number.

68388240 is a gapful number since it is divisible by the number (60) 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 68388240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107609184).

68388240 is an abundant number, since it is smaller than the sum of its proper divisors (146830128).

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

68388240 is a wasteful number, since it uses less digits than its factorization.

68388240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336 (or 4330 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 68388240 is about 8269.7182539673. The cubic root of 68388240 is about 408.9408315043.

The spelling of 68388240 in words is "sixty-eight million, three hundred eighty-eight thousand, two hundred forty".