664067620 has 12 divisors (see below), whose sum is σ = 1394542044. Its totient is φ = 265627040.

The previous prime is 664067603. The next prime is 664067623. The reversal of 664067620 is 26760466.

664067620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104366656 + 559700964 = 10216^2 + 23658^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664067620.

It is not an unprimeable number, because it can be changed into a prime (664067623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16601671 + ... + 16601710.

It is an arithmetic number, because the mean of its divisors is an integer number (116211837).

Almost surely, 2^664067620 is an apocalyptic number.

It is an amenable number.

664067620 is an abundant number, since it is smaller than the sum of its proper divisors (730474424).

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

664067620 is a wasteful number, since it uses less digits than its factorization.

664067620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33203390 (or 33203388 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 664067620 is about 25769.5095025109. The cubic root of 664067620 is about 872.4437480667.

The spelling of 664067620 in words is "six hundred sixty-four million, sixty-seven thousand, six hundred twenty".