420728306 has 16 divisors (see below), whose sum is σ = 649893888. Its totient is φ = 204151200.

The previous prime is 420728281. The next prime is 420728339. The reversal of 420728306 is 603827024.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2231 + ... + 29093.

It is an arithmetic number, because the mean of its divisors is an integer number (40618368).

Almost surely, 2^420728306 is an apocalyptic number.

420728306 is a deficient number, since it is larger than the sum of its proper divisors (229165582).

420728306 is a wasteful number, since it uses less digits than its factorization.

420728306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27097.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 420728306 is about 20511.6626824838. The cubic root of 420728306 is about 749.3198610307.

The spelling of 420728306 in words is "four hundred twenty million, seven hundred twenty-eight thousand, three hundred six".