66143240 has 32 divisors (see below), whose sum is σ = 149143680. Its totient is φ = 26400192.

The previous prime is 66143221. The next prime is 66143257. The reversal of 66143240 is 4234166.

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, 20369 + ... + 23391.

It is an arithmetic number, because the mean of its divisors is an integer number (4660740).

Almost surely, 2^66143240 is an apocalyptic number.

It is an amenable number.

66143240 is an abundant number, since it is smaller than the sum of its proper divisors (83000440).

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

66143240 is a wasteful number, since it uses less digits than its factorization.

66143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581 (or 3577 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66143240 is about 8132.8494391572. The cubic root of 66143240 is about 404.4161479977.

The spelling of 66143240 in words is "sixty-six million, one hundred forty-three thousand, two hundred forty".