68195840 has 80 divisors (see below), whose sum is σ = 173238912. Its totient is φ = 25657344.

The previous prime is 68195821. The next prime is 68195861. The reversal of 68195840 is 4859186.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42737 + ... + 44303.

Almost surely, 2^68195840 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 68195840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86619456).

68195840 is an abundant number, since it is smaller than the sum of its proper divisors (105043072).

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

68195840 is a wasteful number, since it uses less digits than its factorization.

68195840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1591 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 68195840 is about 8258.0772580547. The cubic root of 68195840 is about 408.5569735169.

The spelling of 68195840 in words is "sixty-eight million, one hundred ninety-five thousand, eight hundred forty".