8420663 has 4 divisors (see below), whose sum is σ = 8467368.
Its totient is φ = 8373960.
The previous prime is 8420653. The next prime is 8420669. The reversal of 8420663 is 3660248.
8420663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 8420663 - 28 = 8420407 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (8420669) 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, 23081 + ... + 23442.
It is an arithmetic number, because the mean of its divisors is an integer number (2116842).
Almost surely, 28420663 is an apocalyptic number.
8420663 is a deficient number, since it is larger than the sum of its proper divisors (46705).
8420663 is a wasteful number, since it uses less digits than its factorization.
8420663 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 46704.
The product of its (nonzero) digits is 6912, while the sum is 29.
The square root of 8420663 is about 2901.8378659050.
The cubic root of 8420663 is about 203.4458158136.
The spelling of 8420663 in words is "eight million, four hundred twenty thousand, six hundred sixty-three".