66664884 has 96 divisors (see below), whose sum is σ = 186447744. Its totient is φ = 18270720.

The previous prime is 66664883. The next prime is 66664889. The reversal of 66664884 is 48846666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90582 + ... + 91314.

It is an arithmetic number, because the mean of its divisors is an integer number (1942164).

Almost surely, 2^66664884 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 66664884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93223872).

66664884 is an abundant number, since it is smaller than the sum of its proper divisors (119782860).

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

66664884 is a wasteful number, since it uses less digits than its factorization.

66664884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 815 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The square root of 66664884 is about 8164.8566429546. The cubic root of 66664884 is about 405.4765188264.

The spelling of 66664884 in words is "sixty-six million, six hundred sixty-four thousand, eight hundred eighty-four".