28748077 has 4 divisors (see below), whose sum is σ = 29739420. Its totient is φ = 27756736.

The previous prime is 28748063. The next prime is 28748087. The reversal of 28748077 is 77084782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77084782 = 2 ⋅38542391.

It can be written as a sum of positive squares in 2 ways, for example, as 19131876 + 9616201 = 4374^2 + 3101^2 .

It is a cyclic number.

It is not a de Polignac number, because 28748077 - 2⁷ = 28747949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495628 + ... + 495685.

It is an arithmetic number, because the mean of its divisors is an integer number (7434855).

Almost surely, 2^28748077 is an apocalyptic number.

It is an amenable number.

28748077 is a deficient number, since it is larger than the sum of its proper divisors (991343).

28748077 is an equidigital number, since it uses as much as digits as its factorization.

28748077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991342.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 28748077 is about 5361.7233237085. The cubic root of 28748077 is about 306.3394534189.

The spelling of 28748077 in words is "twenty-eight million, seven hundred forty-eight thousand, seventy-seven".