664075916 has 48 divisors (see below), whose sum is σ = 1421817600. Its totient is φ = 265042368.

The previous prime is 664075861. The next prime is 664075991. The reversal of 664075916 is 619570466.

It is a happy number.

It is a super-2 number, since 2×664075916² = 881993644422478112, which contains 22 as substring.

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, 20810 + ... + 41966.

It is an arithmetic number, because the mean of its divisors is an integer number (29621200).

Almost surely, 2^664075916 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 664075916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710908800).

664075916 is an abundant number, since it is smaller than the sum of its proper divisors (757741684).

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

664075916 is a wasteful number, since it uses less digits than its factorization.

664075916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21246 (or 21244 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 664075916 is about 25769.6704674313. The cubic root of 664075916 is about 872.4473811120.

The spelling of 664075916 in words is "six hundred sixty-four million, seventy-five thousand, nine hundred sixteen".