28128707 has 2 divisors, whose sum is σ = 28128708. Its totient is φ = 28128706.

The previous prime is 28128689. The next prime is 28128719. The reversal of 28128707 is 70782182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28128707 - 2¹⁴ = 28112323 is a prime.

It is not a weakly prime, because it can be changed into another prime (28128787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064353 + 14064354.

It is an arithmetic number, because the mean of its divisors is an integer number (14064354).

Almost surely, 2^28128707 is an apocalyptic number.

28128707 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128707 is an equidigital number, since it uses as much as digits as its factorization.

28128707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28128707 is about 5303.6503466952. The cubic root of 28128707 is about 304.1234602126.

The spelling of 28128707 in words is "twenty-eight million, one hundred twenty-eight thousand, seven hundred seven".