66858312 has 16 divisors (see below), whose sum is σ = 167145840. Its totient is φ = 22286096.

The previous prime is 66858307. The next prime is 66858343. The reversal of 66858312 is 21385866.

It is a happy 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, 1392858 + ... + 1392905.

It is an arithmetic number, because the mean of its divisors is an integer number (10446615).

Almost surely, 2^66858312 is an apocalyptic number.

It is an amenable number.

66858312 is an abundant number, since it is smaller than the sum of its proper divisors (100287528).

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

66858312 is a wasteful number, since it uses less digits than its factorization.

66858312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785772 (or 2785768 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 66858312 is about 8176.6932191443. The cubic root of 66858312 is about 405.8683031968.

The spelling of 66858312 in words is "sixty-six million, eight hundred fifty-eight thousand, three hundred twelve".