28777901 has 2 divisors, whose sum is σ = 28777902. Its totient is φ = 28777900.

The previous prime is 28777877. The next prime is 28777919. The reversal of 28777901 is 10977782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 1267876 = 5245^2 + 1126^2 .

It is a cyclic number.

It is not a de Polignac number, because 28777901 - 2¹⁴ = 28761517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28777921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14388950 + 14388951.

It is an arithmetic number, because the mean of its divisors is an integer number (14388951).

Almost surely, 2^28777901 is an apocalyptic number.

It is an amenable number.

28777901 is a deficient number, since it is larger than the sum of its proper divisors (1).

28777901 is an equidigital number, since it uses as much as digits as its factorization.

28777901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 28777901 is about 5364.5037981159. The cubic root of 28777901 is about 306.4453516358.

The spelling of 28777901 in words is "twenty-eight million, seven hundred seventy-seven thousand, nine hundred one".