28313977 has 2 divisors, whose sum is σ = 28313978. Its totient is φ = 28313976.

The previous prime is 28313969. The next prime is 28313983. The reversal of 28313977 is 77931382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 11634921 = 4084^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 28313977 - 2³ = 28313969 is a prime.

It is not a weakly prime, because it can be changed into another prime (28314977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156988 + 14156989.

It is an arithmetic number, because the mean of its divisors is an integer number (14156989).

Almost surely, 2^28313977 is an apocalyptic number.

It is an amenable number.

28313977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28313977 is an equidigital number, since it uses as much as digits as its factorization.

28313977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 28313977 is about 5321.0879526653. The cubic root of 28313977 is about 304.7897036418.

The spelling of 28313977 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred seventy-seven".