28730851 has 4 divisors (see below), whose sum is σ = 29721600. Its totient is φ = 27740104.

The previous prime is 28730813. The next prime is 28730861. The reversal of 28730851 is 15803782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28730851 - 2¹⁵ = 28698083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28730861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495331 + ... + 495388.

It is an arithmetic number, because the mean of its divisors is an integer number (7430400).

Almost surely, 2^28730851 is an apocalyptic number.

28730851 is a deficient number, since it is larger than the sum of its proper divisors (990749).

28730851 is an equidigital number, since it uses as much as digits as its factorization.

28730851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990748.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28730851 is about 5360.1166964909. The cubic root of 28730851 is about 306.2782544527.

The spelling of 28730851 in words is "twenty-eight million, seven hundred thirty thousand, eight hundred fifty-one".