68544240 has 80 divisors (see below), whose sum is σ = 214941600. Its totient is φ = 18067456.

The previous prime is 68544167. The next prime is 68544263. The reversal of 68544240 is 4244586.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19756 + ... + 22964.

It is an arithmetic number, because the mean of its divisors is an integer number (2686770).

Almost surely, 2^68544240 is an apocalyptic number.

68544240 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 68544240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107470800).

68544240 is an abundant number, since it is smaller than the sum of its proper divisors (146397360).

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

68544240 is a wasteful number, since it uses less digits than its factorization.

68544240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 68544240 is about 8279.1448833802. The cubic root of 68544240 is about 409.2515395237.

The spelling of 68544240 in words is "sixty-eight million, five hundred forty-four thousand, two hundred forty".