28098761 has 4 divisors (see below), whose sum is σ = 28277892. Its totient is φ = 27919632.

The previous prime is 28098757. The next prime is 28098769. The reversal of 28098761 is 16789082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16789082 = 2 ⋅8394541.

It can be written as a sum of positive squares in 2 ways, for example, as 5593225 + 22505536 = 2365^2 + 4744^2 .

It is a cyclic number.

It is not a de Polignac number, because 28098761 - 2² = 28098757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28098769) 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 in 3 ways as a sum of consecutive naturals, for example, 89330 + ... + 89643.

It is an arithmetic number, because the mean of its divisors is an integer number (7069473).

Almost surely, 2^28098761 is an apocalyptic number.

It is an amenable number.

28098761 is a deficient number, since it is larger than the sum of its proper divisors (179131).

28098761 is a wasteful number, since it uses less digits than its factorization.

28098761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179130.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28098761 is about 5300.8264449989. The cubic root of 28098761 is about 304.0154979691.

The spelling of 28098761 in words is "twenty-eight million, ninety-eight thousand, seven hundred sixty-one".