28130549 has 2 divisors, whose sum is σ = 28130550. Its totient is φ = 28130548.

The previous prime is 28130533. The next prime is 28130579. The reversal of 28130549 is 94503182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 515524 = 5255^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 28130549 - 2⁴ = 28130533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28130519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14065274 + 14065275.

It is an arithmetic number, because the mean of its divisors is an integer number (14065275).

Almost surely, 2^28130549 is an apocalyptic number.

It is an amenable number.

28130549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28130549 is an equidigital number, since it uses as much as digits as its factorization.

28130549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28130549 is about 5303.8239978340. The cubic root of 28130549 is about 304.1300985458.

The spelling of 28130549 in words is "twenty-eight million, one hundred thirty thousand, five hundred forty-nine".