28032757 has 2 divisors, whose sum is σ = 28032758. Its totient is φ = 28032756.

The previous prime is 28032751. The next prime is 28032761. The reversal of 28032757 is 75723082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 13024881 = 3874^2 + 3609^2 .

It is a cyclic number.

It is not a de Polignac number, because 28032757 - 2⁷ = 28032629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28032751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14016378 + 14016379.

It is an arithmetic number, because the mean of its divisors is an integer number (14016379).

Almost surely, 2^28032757 is an apocalyptic number.

It is an amenable number.

28032757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28032757 is an equidigital number, since it uses as much as digits as its factorization.

28032757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28032757 is about 5294.5969629425. The cubic root of 28032757 is about 303.7772671644. Note that the first 3 decimals are identical.

The spelling of 28032757 in words is "twenty-eight million, thirty-two thousand, seven hundred fifty-seven".