66857648 has 40 divisors (see below), whose sum is σ = 152188176. Its totient is φ = 28051200.

The previous prime is 66857627. The next prime is 66857683. The reversal of 66857648 is 84675866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66857596 and 66857605.

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, 12323 + ... + 16898.

Almost surely, 2^66857648 is an apocalyptic number.

It is an amenable number.

66857648 is an abundant number, since it is smaller than the sum of its proper divisors (85330528).

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

66857648 is a wasteful number, since it uses less digits than its factorization.

66857648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29253 (or 29247 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 50.

The square root of 66857648 is about 8176.6526158325. The cubic root of 66857648 is about 405.8669595720.

The spelling of 66857648 in words is "sixty-six million, eight hundred fifty-seven thousand, six hundred forty-eight".