28280977 has 2 divisors, whose sum is σ = 28280978. Its totient is φ = 28280976.

The previous prime is 28280969. The next prime is 28280983. The reversal of 28280977 is 77908282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24910081 + 3370896 = 4991^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 28280977 - 2³ = 28280969 is a prime.

It is not a weakly prime, because it can be changed into another prime (28280947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140488 + 14140489.

It is an arithmetic number, because the mean of its divisors is an integer number (14140489).

Almost surely, 2^28280977 is an apocalyptic number.

It is an amenable number.

28280977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280977 is an equidigital number, since it uses as much as digits as its factorization.

28280977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28280977 is about 5317.9861789967. The cubic root of 28280977 is about 304.6712465947.

The spelling of 28280977 in words is "twenty-eight million, two hundred eighty thousand, nine hundred seventy-seven".