66404604 has 72 divisors (see below), whose sum is σ = 186106368. Its totient is φ = 18355680.

The previous prime is 66404593. The next prime is 66404623. The reversal of 66404604 is 40640466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16407 + ... + 20049.

Almost surely, 2^66404604 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 66404604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93053184).

66404604 is an abundant number, since it is smaller than the sum of its proper divisors (119701764).

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

66404604 is a wasteful number, since it uses less digits than its factorization.

66404604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695 (or 3686 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 66404604 is about 8148.9020119277. The cubic root of 66404604 is about 404.9481293118.

The spelling of 66404604 in words is "sixty-six million, four hundred four thousand, six hundred four".