66664832 has 32 divisors (see below), whose sum is σ = 143028480. Its totient is φ = 30767616.

The previous prime is 66664813. The next prime is 66664859. The reversal of 66664832 is 23846666.

66664832 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 66664832.

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, 18368 + ... + 21695.

It is an arithmetic number, because the mean of its divisors is an integer number (4469640).

Almost surely, 2^66664832 is an apocalyptic number.

It is an amenable number.

66664832 is an abundant number, since it is smaller than the sum of its proper divisors (76363648).

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

66664832 is a wasteful number, since it uses less digits than its factorization.

66664832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40090 (or 40078 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 66664832 is about 8164.8534585747. The cubic root of 66664832 is about 405.4764133997.

The spelling of 66664832 in words is "sixty-six million, six hundred sixty-four thousand, eight hundred thirty-two".