66387648 has 28 divisors (see below), whose sum is σ = 175651160. Its totient is φ = 22129152.

The previous prime is 66387631. The next prime is 66387661. The reversal of 66387648 is 84678366.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 66387597 and 66387606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172693 + ... + 173076.

Almost surely, 2^66387648 is an apocalyptic number.

It is an amenable number.

66387648 is an abundant number, since it is smaller than the sum of its proper divisors (109263512).

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

66387648 is a wasteful number, since it uses less digits than its factorization.

66387648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345784 (or 345774 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 48.

The square root of 66387648 is about 8147.8615599432. The cubic root of 66387648 is about 404.9136593877.

The spelling of 66387648 in words is "sixty-six million, three hundred eighty-seven thousand, six hundred forty-eight".