68440288 has 48 divisors (see below), whose sum is σ = 155766240. Its totient is φ = 28993536.

The previous prime is 68440259. The next prime is 68440289. The reversal of 68440288 is 88204486.

It is a self number, because there is not a number n which added to its sum of digits gives 68440288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68440289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18220 + ... + 21652.

It is an arithmetic number, because the mean of its divisors is an integer number (3245130).

Almost surely, 2^68440288 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 68440288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77883120).

68440288 is an abundant number, since it is smaller than the sum of its proper divisors (87325952).

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

68440288 is a wasteful number, since it uses less digits than its factorization.

68440288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 68440288 is about 8272.8645583014. The cubic root of 68440288 is about 409.0445489223.

The spelling of 68440288 in words is "sixty-eight million, four hundred forty thousand, two hundred eighty-eight".