428815 has 8 divisors (see below), whose sum is σ = 519120. Its totient is φ = 340032.

The previous prime is 428809. The next prime is 428833. The reversal of 428815 is 518824.

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

It is a cyclic number.

It is not a de Polignac number, because 428815 - 2³ = 428807 is a prime.

It is a congruent 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, 387 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (64890).

2⁴²⁸⁸¹⁵ is an apocalyptic number.

428815 is a deficient number, since it is larger than the sum of its proper divisors (90305).

428815 is a wasteful number, since it uses less digits than its factorization.

428815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its digits is 2560, while the sum is 28.

The square root of 428815 is about 654.8396750350. The cubic root of 428815 is about 75.4090245233.

Subtracting 428815 from its reverse (518824), we obtain a palindrome (90009).

It can be divided in two parts, 42 and 8815, that multiplied together give a triangular number (370230 = T₈₆₀).

The spelling of 428815 in words is "four hundred twenty-eight thousand, eight hundred fifteen".