28728454 has 8 divisors (see below), whose sum is σ = 44143848. Its totient is φ = 14013840.

The previous prime is 28728443. The next prime is 28728463. The reversal of 28728454 is 45482782.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175092 + ... + 175255.

It is an arithmetic number, because the mean of its divisors is an integer number (5517981).

Almost surely, 2^28728454 is an apocalyptic number.

28728454 is a deficient number, since it is larger than the sum of its proper divisors (15415394).

28728454 is a wasteful number, since it uses less digits than its factorization.

28728454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350390.

The product of its digits is 143360, while the sum is 40.

The square root of 28728454 is about 5359.8930959488. The cubic root of 28728454 is about 306.2697366705.

The spelling of 28728454 in words is "twenty-eight million, seven hundred twenty-eight thousand, four hundred fifty-four".