28780571 has 2 divisors, whose sum is σ = 28780572. Its totient is φ = 28780570.

The previous prime is 28780559. The next prime is 28780607. The reversal of 28780571 is 17508782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28780571 is a prime.

It is not a weakly prime, because it can be changed into another prime (28780771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390285 + 14390286.

It is an arithmetic number, because the mean of its divisors is an integer number (14390286).

Almost surely, 2^28780571 is an apocalyptic number.

28780571 is a deficient number, since it is larger than the sum of its proper divisors (1).

28780571 is an equidigital number, since it uses as much as digits as its factorization.

28780571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28780571 is about 5364.7526504024. The cubic root of 28780571 is about 306.4548286275.

The spelling of 28780571 in words is "twenty-eight million, seven hundred eighty thousand, five hundred seventy-one".