66857394 has 8 divisors (see below), whose sum is σ = 133714800. Its totient is φ = 22285796.

The previous prime is 66857387. The next prime is 66857419. The reversal of 66857394 is 49375866.

It is a sphenic number, since it is the product of 3 distinct primes.

66857394 is an admirable number.

It is a super-2 number, since 2×66857394² = 8939822264942472, which contains 22 as substring.

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, 5571444 + ... + 5571455.

It is an arithmetic number, because the mean of its divisors is an integer number (16714350).

Almost surely, 2^66857394 is an apocalyptic number.

66857394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66857394 is a wasteful number, since it uses less digits than its factorization.

66857394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11142904.

The product of its digits is 1088640, while the sum is 48.

The square root of 66857394 is about 8176.6370837894. The cubic root of 66857394 is about 405.8664455928.

The spelling of 66857394 in words is "sixty-six million, eight hundred fifty-seven thousand, three hundred ninety-four".