66004320 has 96 divisors (see below), whose sum is σ = 209260800. Its totient is φ = 17487360.

The previous prime is 66004307. The next prime is 66004327. The reversal of 66004320 is 2340066.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66004327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95175 + ... + 95865.

It is an arithmetic number, because the mean of its divisors is an integer number (2179800).

Almost surely, 2^66004320 is an apocalyptic number.

66004320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66004320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104630400).

66004320 is an abundant number, since it is smaller than the sum of its proper divisors (143256480).

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

66004320 is a wasteful number, since it uses less digits than its factorization.

66004320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 66004320 is about 8124.3042779059. The cubic root of 66004320 is about 404.1328191208.

Adding to 66004320 its reverse (2340066), we get a palindrome (68344386).

The spelling of 66004320 in words is "sixty-six million, four thousand, three hundred twenty".