28751977 has 2 divisors, whose sum is σ = 28751978. Its totient is φ = 28751976.

The previous prime is 28751969. The next prime is 28752007. The reversal of 28751977 is 77915782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15531481 + 13220496 = 3941^2 + 3636^2 .

It is a cyclic number.

It is not a de Polignac number, because 28751977 - 2³ = 28751969 is a prime.

It is not a weakly prime, because it can be changed into another prime (28754977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14375988 + 14375989.

It is an arithmetic number, because the mean of its divisors is an integer number (14375989).

Almost surely, 2^28751977 is an apocalyptic number.

It is an amenable number.

28751977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28751977 is an equidigital number, since it uses as much as digits as its factorization.

28751977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 28751977 is about 5362.0870004132. The cubic root of 28751977 is about 306.3533055901.

The spelling of 28751977 in words is "twenty-eight million, seven hundred fifty-one thousand, nine hundred seventy-seven".