420664667 has 4 divisors (see below), whose sum is σ = 425733000. Its totient is φ = 415596336.

The previous prime is 420664663. The next prime is 420664757. The reversal of 420664667 is 766466024.

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 420664667 - 2² = 420664663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420664661) 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, 2534042 + ... + 2534207.

It is an arithmetic number, because the mean of its divisors is an integer number (106433250).

Almost surely, 2^420664667 is an apocalyptic number.

420664667 is a deficient number, since it is larger than the sum of its proper divisors (5068333).

420664667 is an equidigital number, since it uses as much as digits as its factorization.

420664667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068332.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 420664667 is about 20510.1113356315. Note that the first 3 decimals coincide. The cubic root of 420664667 is about 749.2820786341.

The spelling of 420664667 in words is "four hundred twenty million, six hundred sixty-four thousand, six hundred sixty-seven".