664698528 has 384 divisors, whose sum is σ = 2275983360. Its totient is φ = 187038720.

The previous prime is 664698511. The next prime is 664698533. The reversal of 664698528 is 825896466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8008375 + ... + 8008457.

It is an arithmetic number, because the mean of its divisors is an integer number (5927040).

Almost surely, 2^664698528 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 664698528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137991680).

664698528 is an abundant number, since it is smaller than the sum of its proper divisors (1611284832).

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

664698528 is a wasteful number, since it uses less digits than its factorization.

664698528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 155 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 664698528 is about 25781.7479624637. The cubic root of 664698528 is about 872.7199536318.

The spelling of 664698528 in words is "six hundred sixty-four million, six hundred ninety-eight thousand, five hundred twenty-eight".