66847144 has 32 divisors (see below), whose sum is σ = 154264320. Its totient is φ = 26444736.

The previous prime is 66847127. The next prime is 66847159. The reversal of 66847144 is 44174866.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66847097 and 66847106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45184 + ... + 46639.

It is an arithmetic number, because the mean of its divisors is an integer number (4820760).

Almost surely, 2^66847144 is an apocalyptic number.

It is an amenable number.

66847144 is an abundant number, since it is smaller than the sum of its proper divisors (87417176).

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

66847144 is a wasteful number, since it uses less digits than its factorization.

66847144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91849 (or 91845 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 66847144 is about 8176.0102739661. The cubic root of 66847144 is about 405.8457032164.

The spelling of 66847144 in words is "sixty-six million, eight hundred forty-seven thousand, one hundred forty-four".