668894427 has 24 divisors (see below), whose sum is σ = 1035360144. Its totient is φ = 414633984.

The previous prime is 668894407. The next prime is 668894431. The reversal of 668894427 is 724498866.

It is not a de Polignac number, because 668894427 - 2¹⁰ = 668893403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668894407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13638 + ... + 39035.

It is an arithmetic number, because the mean of its divisors is an integer number (43140006).

Almost surely, 2^668894427 is an apocalyptic number.

668894427 is a deficient number, since it is larger than the sum of its proper divisors (366465717).

668894427 is a wasteful number, since it uses less digits than its factorization.

668894427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52779 (or 52776 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 668894427 is about 25862.9933882372. The cubic root of 668894427 is about 874.5524468210.

The spelling of 668894427 in words is "six hundred sixty-eight million, eight hundred ninety-four thousand, four hundred twenty-seven".