427221666 has 24 divisors (see below), whose sum is σ = 926106480.
Its totient is φ = 142336536.
The previous prime is 427221661. The next prime is 427221673. The reversal of 427221666 is 666122724.
It is a self number, because there is not a number n which added to its sum of digits gives 427221666.
It is not an unprimeable number, because it can be changed into a prime (427221661) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41821 + ... + 51023.
It is an arithmetic number, because the mean of its divisors is an integer number (38587770).
Almost surely, 2427221666 is an apocalyptic number.
427221666 is an abundant number, since it is smaller than the sum of its proper divisors (498884814).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
427221666 is a wasteful number, since it uses less digits than its factorization.
427221666 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 11790 (or 11787 counting only the distinct ones).
The product of its digits is 48384, while the sum is 36.
The square root of 427221666 is about 20669.3412086597.
The cubic root of 427221666 is about 753.1551031533.
The spelling of 427221666 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred sixty-six".