428507 has 6 divisors (see below), whose sum is σ = 452628. Its totient is φ = 405612.

The previous prime is 428503. The next prime is 428509. The reversal of 428507 is 705824.

It is not a de Polignac number, because 428507 - 2² = 428503 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428507.

It is not an unprimeable number, because it can be changed into a prime (428503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (75438).

2⁴²⁸⁵⁰⁷ is an apocalyptic number.

428507 is a deficient number, since it is larger than the sum of its proper divisors (24121).

428507 is a wasteful number, since it uses less digits than its factorization.

428507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 428507 is about 654.6044607242. The cubic root of 428507 is about 75.3909658092.

The spelling of 428507 in words is "four hundred twenty-eight thousand, five hundred seven".