68036440 has 64 divisors (see below), whose sum is σ = 157593600. Its totient is φ = 26425728.

The previous prime is 68036429. The next prime is 68036443. The reversal of 68036440 is 4463086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68036443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299607 + ... + 299833.

It is an arithmetic number, because the mean of its divisors is an integer number (2462400).

Almost surely, 2^68036440 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 68036440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78796800).

68036440 is an abundant number, since it is smaller than the sum of its proper divisors (89557160).

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

68036440 is a wasteful number, since it uses less digits than its factorization.

68036440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 68036440 is about 8248.4204548507. The cubic root of 68036440 is about 408.2384067366.

The spelling of 68036440 in words is "sixty-eight million, thirty-six thousand, four hundred forty".