66731448 has 32 divisors (see below), whose sum is σ = 190661760. Its totient is φ = 19066080.

The previous prime is 66731411. The next prime is 66731449. The reversal of 66731448 is 84413766.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198438 + ... + 198773.

It is an arithmetic number, because the mean of its divisors is an integer number (5958180).

Almost surely, 2^66731448 is an apocalyptic number.

It is an amenable number.

66731448 is an abundant number, since it is smaller than the sum of its proper divisors (123930312).

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

66731448 is a wasteful number, since it uses less digits than its factorization.

66731448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397227 (or 397223 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 66731448 is about 8168.9318763226. The cubic root of 66731448 is about 405.6114282383.

The spelling of 66731448 in words is "sixty-six million, seven hundred thirty-one thousand, four hundred forty-eight".