28709851 has 2 divisors, whose sum is σ = 28709852. Its totient is φ = 28709850.

The previous prime is 28709801. The next prime is 28709861. The reversal of 28709851 is 15890782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28709851 - 2¹⁵ = 28677083 is a prime.

It is not a weakly prime, because it can be changed into another prime (28709801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14354925 + 14354926.

It is an arithmetic number, because the mean of its divisors is an integer number (14354926).

Almost surely, 2^28709851 is an apocalyptic number.

28709851 is a deficient number, since it is larger than the sum of its proper divisors (1).

28709851 is an equidigital number, since it uses as much as digits as its factorization.

28709851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28709851 is about 5358.1574258321. The cubic root of 28709851 is about 306.2036144657.

It can be divided in two parts, 2870 and 9851, that added together give a palindrome (12721).

The spelling of 28709851 in words is "twenty-eight million, seven hundred nine thousand, eight hundred fifty-one".