66847740 has 48 divisors (see below), whose sum is σ = 198186912. Its totient is φ = 16777216.

The previous prime is 66847727. The next prime is 66847747. The reversal of 66847740 is 4774866.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66847692 and 66847701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66847747) by changing a digit.

In principle, a polygon with 66847740 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31749 + ... + 33788.

It is an arithmetic number, because the mean of its divisors is an integer number (4128894).

Almost surely, 2^66847740 is an apocalyptic number.

66847740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66847740 is an abundant number, since it is smaller than the sum of its proper divisors (131339172).

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

66847740 is a wasteful number, since it uses less digits than its factorization.

66847740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65566 (or 65564 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 66847740 is about 8176.0467219800. The cubic root of 66847740 is about 405.8469093678.

The spelling of 66847740 in words is "sixty-six million, eight hundred forty-seven thousand, seven hundred forty".