420428665 has 8 divisors (see below), whose sum is σ = 520789248. Its totient is φ = 325493040.

The previous prime is 420428663. The next prime is 420428737. The reversal of 420428665 is 566824024.

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

It is not a de Polignac number, because 420428665 - 2¹ = 420428663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420428663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356067 + ... + 1356376.

It is an arithmetic number, because the mean of its divisors is an integer number (65098656).

Almost surely, 2^420428665 is an apocalyptic number.

It is an amenable number.

420428665 is a deficient number, since it is larger than the sum of its proper divisors (100360583).

420428665 is a wasteful number, since it uses less digits than its factorization.

420428665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712479.

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 420428665 is about 20504.3572198691. The cubic root of 420428665 is about 749.1419312577.

The spelling of 420428665 in words is "four hundred twenty million, four hundred twenty-eight thousand, six hundred sixty-five".