8639428 has 12 divisors (see below), whose sum is σ = 17278912. Its totient is φ = 3702600.

The previous prime is 8639413. The next prime is 8639441. The reversal of 8639428 is 8249368.

8639428 is an admirable number.

It is a super-3 number, since 3×8639428³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 154248 + ... + 154303.

Almost surely, 2^8639428 is an apocalyptic number.

It is an amenable number.

8639428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8639428 is a wasteful number, since it uses less digits than its factorization.

8639428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308562 (or 308560 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 8639428 is about 2939.2903905535. The cubic root of 8639428 is about 205.1925852316.

The spelling of 8639428 in words is "eight million, six hundred thirty-nine thousand, four hundred twenty-eight".