68554640 has 160 divisors (see below), whose sum is σ = 205701120. Its totient is φ = 20620800.

The previous prime is 68554639. The next prime is 68554687. The reversal of 68554640 is 4645586.

It is a junction number, because it is equal to n+sod(n) for n = 68554594 and 68554603.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190781 + ... + 191139.

It is an arithmetic number, because the mean of its divisors is an integer number (1285632).

Almost surely, 2^68554640 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 68554640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102850560).

68554640 is an abundant number, since it is smaller than the sum of its proper divisors (137146480).

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

68554640 is a wasteful number, since it uses less digits than its factorization.

68554640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 68554640 is about 8279.7729437467. The cubic root of 68554640 is about 409.2722366227.

It can be divided in two parts, 685546 and 40, that added together give a palindrome (685586).

The spelling of 68554640 in words is "sixty-eight million, five hundred fifty-four thousand, six hundred forty".