428875385 has 8 divisors (see below), whose sum is σ = 515006856. Its totient is φ = 342862720.

The previous prime is 428875361. The next prime is 428875387. The reversal of 428875385 is 583578824.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54878464 + 373996921 = 7408^2 + 19339^2 .

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

It is not a de Polignac number, because 428875385 - 2¹⁴ = 428859001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428875387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21554 + ... + 36363.

It is an arithmetic number, because the mean of its divisors is an integer number (64375857).

Almost surely, 2^428875385 is an apocalyptic number.

It is an amenable number.

428875385 is a deficient number, since it is larger than the sum of its proper divisors (86131471).

428875385 is a wasteful number, since it uses less digits than its factorization.

428875385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59403.

The product of its digits is 2150400, while the sum is 50.

The square root of 428875385 is about 20709.3067242725. The cubic root of 428875385 is about 754.1256401411.

The spelling of 428875385 in words is "four hundred twenty-eight million, eight hundred seventy-five thousand, three hundred eighty-five".