428642 has 8 divisors (see below), whose sum is σ = 649296. Its totient is φ = 212212.

The previous prime is 428639. The next prime is 428657. The reversal of 428642 is 246824.

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

428642 is a modest number, since divided by 642 gives 428 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788 + ... + 1215.

It is an arithmetic number, because the mean of its divisors is an integer number (81162).

2⁴²⁸⁶⁴² is an apocalyptic number.

428642 is a deficient number, since it is larger than the sum of its proper divisors (220654).

428642 is a wasteful number, since it uses less digits than its factorization.

428642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112.

The product of its digits is 3072, while the sum is 26.

The square root of 428642 is about 654.7075683082. The cubic root of 428642 is about 75.3988822195.

The spelling of 428642 in words is "four hundred twenty-eight thousand, six hundred forty-two".