68551840 has 96 divisors (see below), whose sum is σ = 187294464. Its totient is φ = 23224320.

The previous prime is 68551823. The next prime is 68551841. The reversal of 68551840 is 4815586.

It is a self number, because there is not a number n which added to its sum of digits gives 68551840.

It is not an unprimeable number, because it can be changed into a prime (68551841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108325 + ... + 108955.

It is an arithmetic number, because the mean of its divisors is an integer number (1950984).

Almost surely, 2^68551840 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 68551840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93647232).

68551840 is an abundant number, since it is smaller than the sum of its proper divisors (118742624).

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

68551840 is a wasteful number, since it uses less digits than its factorization.

68551840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 68551840 is about 8279.6038552578. The cubic root of 68551840 is about 409.2666645327.

It can be divided in two parts, 685 and 51840, that added together give a palindrome (52525).

The spelling of 68551840 in words is "sixty-eight million, five hundred fifty-one thousand, eight hundred forty".