66608464 has 40 divisors (see below), whose sum is σ = 139491072. Its totient is φ = 30629760.

The previous prime is 66608459. The next prime is 66608497. The reversal of 66608464 is 46480666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89277 + ... + 90019.

Almost surely, 2^66608464 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 66608464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69745536).

66608464 is an abundant number, since it is smaller than the sum of its proper divisors (72882608).

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

66608464 is a wasteful number, since it uses less digits than its factorization.

66608464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 66608464 is about 8161.4008601465. The cubic root of 66608464 is about 405.3620985568.

The spelling of 66608464 in words is "sixty-six million, six hundred eight thousand, four hundred sixty-four".