666287394 has 8 divisors (see below), whose sum is σ = 1332574800. Its totient is φ = 222095796.

The previous prime is 666287393. The next prime is 666287407. The reversal of 666287394 is 493782666.

It is a happy number.

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

666287394 is an admirable number.

It is a super-2 number, since 2×666287394² = 887877782806622472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666287393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55523944 + ... + 55523955.

It is an arithmetic number, because the mean of its divisors is an integer number (166571850).

Almost surely, 2^666287394 is an apocalyptic number.

666287394 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.

666287394 is a wasteful number, since it uses less digits than its factorization.

666287394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111047904.

The product of its digits is 2612736, while the sum is 51.

The square root of 666287394 is about 25812.5433462106. The cubic root of 666287394 is about 873.4147707145.

The spelling of 666287394 in words is "six hundred sixty-six million, two hundred eighty-seven thousand, three hundred ninety-four".