28727646 has 8 divisors (see below), whose sum is σ = 57455304. Its totient is φ = 9575880.

The previous prime is 28727623. The next prime is 28727683. The reversal of 28727646 is 64672782.

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

28727646 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28727598 and 28727607.

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, 2393965 + ... + 2393976.

It is an arithmetic number, because the mean of its divisors is an integer number (7181913).

Almost surely, 2^28727646 is an apocalyptic number.

28727646 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.

28727646 is a wasteful number, since it uses less digits than its factorization.

28727646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787946.

The product of its digits is 225792, while the sum is 42.

The square root of 28727646 is about 5359.8177207812. The cubic root of 28727646 is about 306.2668653214.

The spelling of 28727646 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred forty-six".