28728151 has 2 divisors, whose sum is σ = 28728152. Its totient is φ = 28728150.

The previous prime is 28728121. The next prime is 28728157. The reversal of 28728151 is 15182782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28728151 - 2⁷ = 28728023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28728157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364075 + 14364076.

It is an arithmetic number, because the mean of its divisors is an integer number (14364076).

Almost surely, 2^28728151 is an apocalyptic number.

28728151 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728151 is an equidigital number, since it uses as much as digits as its factorization.

28728151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 34.

The square root of 28728151 is about 5359.8648303852. The cubic root of 28728151 is about 306.2686599209.

The spelling of 28728151 in words is "twenty-eight million, seven hundred twenty-eight thousand, one hundred fifty-one".