28780351 has 2 divisors, whose sum is σ = 28780352. Its totient is φ = 28780350.

The previous prime is 28780331. The next prime is 28780357. The reversal of 28780351 is 15308782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28780351 - 2⁷ = 28780223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28780357) 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 as a sum of consecutive naturals, namely, 14390175 + 14390176.

It is an arithmetic number, because the mean of its divisors is an integer number (14390176).

Almost surely, 2^28780351 is an apocalyptic number.

28780351 is a deficient number, since it is larger than the sum of its proper divisors (1).

28780351 is an equidigital number, since it uses as much as digits as its factorization.

28780351 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28780351 is about 5364.7321461560. The cubic root of 28780351 is about 306.4540477739.

The spelling of 28780351 in words is "twenty-eight million, seven hundred eighty thousand, three hundred fifty-one".