28755457 has 2 divisors, whose sum is σ = 28755458. Its totient is φ = 28755456.

The previous prime is 28755439. The next prime is 28755469. The reversal of 28755457 is 75455782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 14017536 = 3839^2 + 3744^2 .

It is a cyclic number.

It is not a de Polignac number, because 28755457 - 2⁷ = 28755329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28755427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14377728 + 14377729.

It is an arithmetic number, because the mean of its divisors is an integer number (14377729).

Almost surely, 2^28755457 is an apocalyptic number.

It is an amenable number.

28755457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28755457 is an equidigital number, since it uses as much as digits as its factorization.

28755457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 392000, while the sum is 43.

The square root of 28755457 is about 5362.4114911111. The cubic root of 28755457 is about 306.3656649314.

The spelling of 28755457 in words is "twenty-eight million, seven hundred fifty-five thousand, four hundred fifty-seven".