664271552 has 56 divisors (see below), whose sum is σ = 1514246400. Its totient is φ = 283219200.

The previous prime is 664271513. The next prime is 664271561. The reversal of 664271552 is 255172466.

It is a tau number, because it is divible by the number of its divisors (56).

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 7 ways as a sum of consecutive naturals, for example, 85427 + ... + 92877.

Almost surely, 2^664271552 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 664271552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757123200).

664271552 is an abundant number, since it is smaller than the sum of its proper divisors (849974848).

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

664271552 is a wasteful number, since it uses less digits than its factorization.

664271552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7669 (or 7659 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 664271552 is about 25773.4660455283. The cubic root of 664271552 is about 872.5330466981.

The spelling of 664271552 in words is "six hundred sixty-four million, two hundred seventy-one thousand, five hundred fifty-two".