68196640 has 24 divisors (see below), whose sum is σ = 161114940. Its totient is φ = 27278592.

The previous prime is 68196619. The next prime is 68196641. The reversal of 68196640 is 4669186.

It can be written as a sum of positive squares in 2 ways, for example, as 55890576 + 12306064 = 7476^2 + 3508^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 68196593 and 68196602.

It is not an unprimeable number, because it can be changed into a prime (68196641) 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 3 ways as a sum of consecutive naturals, for example, 212955 + ... + 213274.

Almost surely, 2^68196640 is an apocalyptic number.

It is an amenable number.

68196640 is an abundant number, since it is smaller than the sum of its proper divisors (92918300).

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

68196640 is a wasteful number, since it uses less digits than its factorization.

68196640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426244 (or 426236 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 68196640 is about 8258.1256953379. The cubic root of 68196640 is about 408.5585710938.

The spelling of 68196640 in words is "sixty-eight million, one hundred ninety-six thousand, six hundred forty".