66747996 has 72 divisors (see below), whose sum is σ = 201319440. Its totient is φ = 19069344.

The previous prime is 66747979. The next prime is 66748067. The reversal of 66747996 is 69974766.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015 + ... + 11598.

Almost surely, 2^66747996 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 66747996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100659720).

66747996 is an abundant number, since it is smaller than the sum of its proper divisors (134571444).

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

66747996 is a wasteful number, since it uses less digits than its factorization.

66747996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12640 (or 12625 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 66747996 is about 8169.9446754553. The cubic root of 66747996 is about 405.6449531773.

The spelling of 66747996 in words is "sixty-six million, seven hundred forty-seven thousand, nine hundred ninety-six".