68420660 has 108 divisors (see below), whose sum is σ = 184036356. Its totient is φ = 21288960.

The previous prime is 68420647. The next prime is 68420663. The reversal of 68420660 is 6602486.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52388644 + 16032016 = 7238^2 + 4004^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68420663) 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 35 ways as a sum of consecutive naturals, for example, 118292 + ... + 118868.

Almost surely, 2^68420660 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 68420660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92018178).

68420660 is an abundant number, since it is smaller than the sum of its proper divisors (115615696).

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

68420660 is a wasteful number, since it uses less digits than its factorization.

68420660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 68420660 is about 8271.6781852294. The cubic root of 68420660 is about 409.0054418686.

The spelling of 68420660 in words is "sixty-eight million, four hundred twenty thousand, six hundred sixty".