66672256 has 32 divisors (see below), whose sum is σ = 151800480. Its totient is φ = 28573440.

The previous prime is 66672241. The next prime is 66672259. The reversal of 66672256 is 65227666.

It is a happy number.

66672256 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672259) by changing a digit.

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, 36310 + ... + 38101.

It is an arithmetic number, because the mean of its divisors is an integer number (4743765).

Almost surely, 2^66672256 is an apocalyptic number.

It is an amenable number.

66672256 is an abundant number, since it is smaller than the sum of its proper divisors (85128224).

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

66672256 is an equidigital number, since it uses as much as digits as its factorization.

66672256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74432 (or 74420 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The square root of 66672256 is about 8165.3080774702. The cubic root of 66672256 is about 405.4914645397.

The spelling of 66672256 in words is "sixty-six million, six hundred seventy-two thousand, two hundred fifty-six".