28728807 has 8 divisors (see below), whose sum is σ = 38559360. Its totient is φ = 19025400.

The previous prime is 28728787. The next prime is 28728851. The reversal of 28728807 is 70882782.

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

It is not a de Polignac number, because 28728807 - 2¹² = 28724711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31257 + ... + 32162.

It is an arithmetic number, because the mean of its divisors is an integer number (4819920).

Almost surely, 2^28728807 is an apocalyptic number.

28728807 is a deficient number, since it is larger than the sum of its proper divisors (9830553).

28728807 is a wasteful number, since it uses less digits than its factorization.

28728807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63573.

The product of its (nonzero) digits is 100352, while the sum is 42.

The square root of 28728807 is about 5359.9260256089. The cubic root of 28728807 is about 306.2709910921.

The spelling of 28728807 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred seven".