66047724 has 60 divisors (see below), whose sum is σ = 181766200. Its totient is φ = 20855232.

The previous prime is 66047719. The next prime is 66047731. The reversal of 66047724 is 42774066.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 792 + ... + 11520.

Almost surely, 2^66047724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66047724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90883100).

66047724 is an abundant number, since it is smaller than the sum of its proper divisors (115718476).

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

66047724 is a wasteful number, since it uses less digits than its factorization.

66047724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10764 (or 10753 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 66047724 is about 8126.9750830183. The cubic root of 66047724 is about 404.2213847245.

It can be divided in two parts, 660 and 47724, that added together give a palindrome (48384).

The spelling of 66047724 in words is "sixty-six million, forty-seven thousand, seven hundred twenty-four".