68688020 has 24 divisors (see below), whose sum is σ = 144585000. Its totient is φ = 27410432.

The previous prime is 68688019. The next prime is 68688029. The reversal of 68688020 is 2088686.

It can be written as a sum of positive squares in 4 ways, for example, as 559504 + 68128516 = 748^2 + 8254^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68688029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156 + ... + 12804.

It is an arithmetic number, because the mean of its divisors is an integer number (6024375).

Almost surely, 2^68688020 is an apocalyptic number.

It is an amenable number.

68688020 is an abundant number, since it is smaller than the sum of its proper divisors (75896980).

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

68688020 is a wasteful number, since it uses less digits than its factorization.

68688020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8107 (or 8105 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 68688020 is about 8287.8235985088. The cubic root of 68688020 is about 409.5374915420.

The spelling of 68688020 in words is "sixty-eight million, six hundred eighty-eight thousand, twenty".