66458320 has 20 divisors (see below), whose sum is σ = 154515780. Its totient is φ = 26583296.

The previous prime is 66458297. The next prime is 66458363. The reversal of 66458320 is 2385466.

It is a happy number.

66458320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15649936 + 50808384 = 3956^2 + 7128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415285 + ... + 415444.

It is an arithmetic number, because the mean of its divisors is an integer number (7725789).

Almost surely, 2^66458320 is an apocalyptic number.

It is an amenable number.

66458320 is an abundant number, since it is smaller than the sum of its proper divisors (88057460).

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

66458320 is a wasteful number, since it uses less digits than its factorization.

66458320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830742 (or 830736 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 66458320 is about 8152.1972498217. The cubic root of 66458320 is about 405.0572900716.

The spelling of 66458320 in words is "sixty-six million, four hundred fifty-eight thousand, three hundred twenty".