28689142 has 8 divisors (see below), whose sum is σ = 44904816. Its totient is φ = 13720872.

The previous prime is 28689137. The next prime is 28689169. The reversal of 28689142 is 24198682.

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

It is a junction number, because it is equal to n+sod(n) for n = 28689095 and 28689104.

It is a congruent number.

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, 311793 + ... + 311884.

It is an arithmetic number, because the mean of its divisors is an integer number (5613102).

Almost surely, 2^28689142 is an apocalyptic number.

28689142 is a deficient number, since it is larger than the sum of its proper divisors (16215674).

28689142 is a wasteful number, since it uses less digits than its factorization.

28689142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623702.

The product of its digits is 55296, while the sum is 40.

The square root of 28689142 is about 5356.2246032070. The cubic root of 28689142 is about 306.1299731229.

The spelling of 28689142 in words is "twenty-eight million, six hundred eighty-nine thousand, one hundred forty-two".