664502280 has 128 divisors (see below), whose sum is σ = 2182360320. Its totient is φ = 160865280.

The previous prime is 664502243. The next prime is 664502291. The reversal of 664502280 is 82205466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91669 + ... + 98651.

It is an arithmetic number, because the mean of its divisors is an integer number (17049690).

Almost surely, 2^664502280 is an apocalyptic number.

664502280 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 664502280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091180160).

664502280 is an abundant number, since it is smaller than the sum of its proper divisors (1517858040).

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

664502280 is a wasteful number, since it uses less digits than its factorization.

664502280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071 (or 7067 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 664502280 is about 25777.9417331951. The cubic root of 664502280 is about 872.6340568448.

The spelling of 664502280 in words is "six hundred sixty-four million, five hundred two thousand, two hundred eighty".