664663470 has 128 divisors (see below), whose sum is σ = 1714521600. Its totient is φ = 164602368.

The previous prime is 664663469. The next prime is 664663487. The reversal of 664663470 is 74366466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4077609 + ... + 4077771.

It is an arithmetic number, because the mean of its divisors is an integer number (13394700).

Almost surely, 2^664663470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664663470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857260800).

664663470 is an abundant number, since it is smaller than the sum of its proper divisors (1049858130).

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

664663470 is a wasteful number, since it uses less digits than its factorization.

664663470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 435456, while the sum is 42.

The square root of 664663470 is about 25781.0680539034. The cubic root of 664663470 is about 872.7046101576.

The spelling of 664663470 in words is "six hundred sixty-four million, six hundred sixty-three thousand, four hundred seventy".