28011761 has 2 divisors, whose sum is σ = 28011762. Its totient is φ = 28011760.

The previous prime is 28011721. The next prime is 28011773. The reversal of 28011761 is 16711082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23580736 + 4431025 = 4856^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 28011761 - 2²² = 23817457 is a prime.

It is a super-2 number, since 2×28011761² = 1569317508642242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28011761.

It is not a weakly prime, because it can be changed into another prime (28011721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005880 + 14005881.

It is an arithmetic number, because the mean of its divisors is an integer number (14005881).

Almost surely, 2^28011761 is an apocalyptic number.

It is an amenable number.

28011761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28011761 is an equidigital number, since it uses as much as digits as its factorization.

28011761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28011761 is about 5292.6138154980. The cubic root of 28011761 is about 303.7014070968.

The spelling of 28011761 in words is "twenty-eight million, eleven thousand, seven hundred sixty-one".