428618 has 4 divisors (see below), whose sum is σ = 642930. Its totient is φ = 214308.

The previous prime is 428579. The next prime is 428629. The reversal of 428618 is 816824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 426409 + 2209 = 653^2 + 47^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428618.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107153 + ... + 107156.

2⁴²⁸⁶¹⁸ is an apocalyptic number.

428618 is a deficient number, since it is larger than the sum of its proper divisors (214312).

428618 is a wasteful number, since it uses less digits than its factorization.

428618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214311.

The product of its digits is 3072, while the sum is 29.

The square root of 428618 is about 654.6892392578. The cubic root of 428618 is about 75.3974749792.

The spelling of 428618 in words is "four hundred twenty-eight thousand, six hundred eighteen".