664064460 has 96 divisors (see below), whose sum is σ = 2069867520. Its totient is φ = 176750784.

The previous prime is 664064389. The next prime is 664064461. The reversal of 664064460 is 64460466.

It is a happy number.

664064460 is a `hidden beast` number, since 6 + 6 + 4 + 0 + 644 + 6 + 0 = 666.

664064460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (664064461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445837 + ... + 447323.

It is an arithmetic number, because the mean of its divisors is an integer number (21561120).

Almost surely, 2^664064460 is an apocalyptic number.

664064460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664064460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034933760).

664064460 is an abundant number, since it is smaller than the sum of its proper divisors (1405803060).

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

664064460 is a wasteful number, since it uses less digits than its factorization.

664064460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 664064460 is about 25769.4481896683. The cubic root of 664064460 is about 872.4423642084.

The spelling of 664064460 in words is "six hundred sixty-four million, sixty-four thousand, four hundred sixty".