28728654 has 8 divisors (see below), whose sum is σ = 57457320. Its totient is φ = 9576216.

The previous prime is 28728649. The next prime is 28728673. The reversal of 28728654 is 45682782.

It is a happy number.

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

28728654 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2394049 + ... + 2394060.

It is an arithmetic number, because the mean of its divisors is an integer number (7182165).

Almost surely, 2^28728654 is an apocalyptic number.

28728654 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.

28728654 is a wasteful number, since it uses less digits than its factorization.

28728654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788114.

The product of its digits is 215040, while the sum is 42.

The square root of 28728654 is about 5359.9117530049. The cubic root of 28728654 is about 306.2704473922.

The spelling of 28728654 in words is "twenty-eight million, seven hundred twenty-eight thousand, six hundred fifty-four".