668928427 has 8 divisors (see below), whose sum is σ = 708506352. Its totient is φ = 629376000.

The previous prime is 668928401. The next prime is 668928433. The reversal of 668928427 is 724829866.

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

It is a cyclic number.

It is not a de Polignac number, because 668928427 - 2²⁷ = 534710699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668928727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86052 + ... + 93502.

It is an arithmetic number, because the mean of its divisors is an integer number (88563294).

Almost surely, 2^668928427 is an apocalyptic number.

668928427 is a deficient number, since it is larger than the sum of its proper divisors (39577925).

668928427 is a wasteful number, since it uses less digits than its factorization.

668928427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749.

The product of its digits is 2322432, while the sum is 52.

The square root of 668928427 is about 25863.6506897228. The cubic root of 668928427 is about 874.5672644456.

The spelling of 668928427 in words is "six hundred sixty-eight million, nine hundred twenty-eight thousand, four hundred twenty-seven".