28158761 has 2 divisors, whose sum is σ = 28158762. Its totient is φ = 28158760.

The previous prime is 28158751. The next prime is 28158763. The reversal of 28158761 is 16785182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 10686361 = 4180^2 + 3269^2 .

It is a cyclic number.

It is not a de Polignac number, because 28158761 - 2¹⁰ = 28157737 is a prime.

It is a Sophie Germain prime.

Together with 28158763, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 28158761 parts by 7504 straight cuts.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28158763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14079380 + 14079381.

It is an arithmetic number, because the mean of its divisors is an integer number (14079381).

Almost surely, 2^28158761 is an apocalyptic number.

It is an amenable number.

28158761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28158761 is an equidigital number, since it uses as much as digits as its factorization.

28158761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 28158761 is about 5306.4829218608. The cubic root of 28158761 is about 304.2317348086.

The spelling of 28158761 in words is "twenty-eight million, one hundred fifty-eight thousand, seven hundred sixty-one".