28438757 has 2 divisors, whose sum is σ = 28438758. Its totient is φ = 28438756.

The previous prime is 28438733. The next prime is 28438769. The reversal of 28438757 is 75783482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 2540836 = 5089^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 28438757 - 2⁶ = 28438693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28438057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14219378 + 14219379.

It is an arithmetic number, because the mean of its divisors is an integer number (14219379).

Almost surely, 2^28438757 is an apocalyptic number.

It is an amenable number.

28438757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28438757 is an equidigital number, since it uses as much as digits as its factorization.

28438757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 44.

The square root of 28438757 is about 5332.8001087609. The cubic root of 28438757 is about 305.2367846831.

The spelling of 28438757 in words is "twenty-eight million, four hundred thirty-eight thousand, seven hundred fifty-seven".