664247752 has 64 divisors (see below), whose sum is σ = 1506384000. Its totient is φ = 268240896.

The previous prime is 664247747. The next prime is 664247777. The reversal of 664247752 is 257742466.

It is a junction number, because it is equal to n+sod(n) for n = 664247699 and 664247708.

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 15 ways as a sum of consecutive naturals, for example, 208024 + ... + 211192.

It is an arithmetic number, because the mean of its divisors is an integer number (23537250).

Almost surely, 2^664247752 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 664247752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753192000).

664247752 is an abundant number, since it is smaller than the sum of its proper divisors (842136248).

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

664247752 is a wasteful number, since it uses less digits than its factorization.

664247752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3398 (or 3394 counting only the distinct ones).

The product of its digits is 564480, while the sum is 43.

The square root of 664247752 is about 25773.0043262325. The cubic root of 664247752 is about 872.5226259927.

The spelling of 664247752 in words is "six hundred sixty-four million, two hundred forty-seven thousand, seven hundred fifty-two".