664079616 has 108 divisors (see below), whose sum is σ = 1959525568. Its totient is φ = 216179712.

The previous prime is 664079567. The next prime is 664079617. The reversal of 664079616 is 616970466.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664079617) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 95721 + ... + 102423.

Almost surely, 2^664079616 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 664079616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979762784).

664079616 is an abundant number, since it is smaller than the sum of its proper divisors (1295445952).

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

664079616 is a wasteful number, since it uses less digits than its factorization.

664079616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768 (or 6751 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 664079616 is about 25769.7422571511. The cubic root of 664079616 is about 872.4490014334.

The spelling of 664079616 in words is "six hundred sixty-four million, seventy-nine thousand, six hundred sixteen".