66604408 has 32 divisors (see below), whose sum is σ = 135349200. Its totient is φ = 30544128.

The previous prime is 66604339. The next prime is 66604409. The reversal of 66604408 is 80440666.

It is a super-2 number, since 2×66604408² = 8872294330060928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14988 + ... + 18916.

Almost surely, 2^66604408 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 66604408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67674600).

66604408 is an abundant number, since it is smaller than the sum of its proper divisors (68744792).

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

66604408 is a wasteful number, since it uses less digits than its factorization.

66604408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111 (or 4107 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 66604408 is about 8161.1523696106. The cubic root of 66604408 is about 405.3538704632.

The spelling of 66604408 in words is "sixty-six million, six hundred four thousand, four hundred eight".