428614209 has 27 divisors (see below), whose sum is σ = 634648833. Its totient is φ = 278745192.

The previous prime is 428614201. The next prime is 428614211. The reversal of 428614209 is 902416824.

The square root of 428614209 is 20703.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 428614209 - 2³ = 428614201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428614201) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4161252 + ... + 4161354.

Almost surely, 2^428614209 is an apocalyptic number.

428614209 is the 20703-rd square number.

428614209 is the 10352-nd centered octagonal number.

It is an amenable number.

428614209 is a deficient number, since it is larger than the sum of its proper divisors (206034624).

428614209 is an equidigital number, since it uses as much as digits as its factorization.

428614209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The cubic root of 428614209 is about 753.9725268903.

Multiplying 428614209 by its sum of digits (36), we get a square (15430111524 = 124218²).

The spelling of 428614209 in words is "four hundred twenty-eight million, six hundred fourteen thousand, two hundred nine".