428809727 has 4 divisors (see below), whose sum is σ = 451378680. Its totient is φ = 406240776.

The previous prime is 428809721. The next prime is 428809729. The reversal of 428809727 is 727908824.

It is a happy number.

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 428809727 - 2⁸ = 428809471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428809721) 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, 11284448 + ... + 11284485.

It is an arithmetic number, because the mean of its divisors is an integer number (112844670).

Almost surely, 2^428809727 is an apocalyptic number.

428809727 is a deficient number, since it is larger than the sum of its proper divisors (22568953).

428809727 is a wasteful number, since it uses less digits than its factorization.

428809727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22568952.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 428809727 is about 20707.7214342863. The cubic root of 428809727 is about 754.0871542856.

The spelling of 428809727 in words is "four hundred twenty-eight million, eight hundred nine thousand, seven hundred twenty-seven".