68456440 has 64 divisors (see below), whose sum is σ = 169464960. Its totient is φ = 24729600.

The previous prime is 68456419. The next prime is 68456447. The reversal of 68456440 is 4465486.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 68456440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68456447) by changing a digit.

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, 23040 + ... + 25840.

It is an arithmetic number, because the mean of its divisors is an integer number (2647890).

Almost surely, 2^68456440 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 68456440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84732480).

68456440 is an abundant number, since it is smaller than the sum of its proper divisors (101008520).

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

68456440 is a wasteful number, since it uses less digits than its factorization.

68456440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2868 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 68456440 is about 8273.8407042921. The cubic root of 68456440 is about 409.0767247458.

The spelling of 68456440 in words is "sixty-eight million, four hundred fifty-six thousand, four hundred forty".