28006777 has 2 divisors, whose sum is σ = 28006778. Its totient is φ = 28006776.

The previous prime is 28006763. The next prime is 28006789. The reversal of 28006777 is 77760082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 1679616 = 5131^2 + 1296^2 .

It is a cyclic number.

It is not a de Polignac number, because 28006777 - 2²³ = 19618169 is a prime.

It is not a weakly prime, because it can be changed into another prime (28006757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14003388 + 14003389.

It is an arithmetic number, because the mean of its divisors is an integer number (14003389).

Almost surely, 2^28006777 is an apocalyptic number.

It is an amenable number.

28006777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28006777 is an equidigital number, since it uses as much as digits as its factorization.

28006777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 28006777 is about 5292.1429496944. The cubic root of 28006777 is about 303.6833939773.

The spelling of 28006777 in words is "twenty-eight million, six thousand, seven hundred seventy-seven".