664167020 has 96 divisors (see below), whose sum is σ = 1576592640. Its totient is φ = 232899840.

The previous prime is 664167013. The next prime is 664167037. The reversal of 664167020 is 20761466.

664167020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664167020² = 882235660911360800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131167 + ... + 1131753.

It is an arithmetic number, because the mean of its divisors is an integer number (16422840).

Almost surely, 2^664167020 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 664167020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788296320).

664167020 is an abundant number, since it is smaller than the sum of its proper divisors (912425620).

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

664167020 is a wasteful number, since it uses less digits than its factorization.

664167020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 664167020 is about 25771.4380662003. The cubic root of 664167020 is about 872.4872760546.

The spelling of 664167020 in words is "six hundred sixty-four million, one hundred sixty-seven thousand, twenty".