427786666 has 8 divisors (see below), whose sum is σ = 641966724. Its totient is φ = 213797760.

The previous prime is 427786651. The next prime is 427786669. The reversal of 427786666 is 666687724.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 405176641 + 22610025 = 20129^2 + 4755^2 .

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

It is a super-3 number, since 3×427786666³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (427786669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42055 + ... + 51226.

Almost surely, 2^427786666 is an apocalyptic number.

427786666 is a deficient number, since it is larger than the sum of its proper divisors (214180058).

427786666 is a wasteful number, since it uses less digits than its factorization.

427786666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95576.

The product of its digits is 4064256, while the sum is 52.

The square root of 427786666 is about 20683.0042788759. The cubic root of 427786666 is about 753.4869723882.

The spelling of 427786666 in words is "four hundred twenty-seven million, seven hundred eighty-six thousand, six hundred sixty-six".