28747877 has 4 divisors (see below), whose sum is σ = 28758816. Its totient is φ = 28736940.

The previous prime is 28747843. The next prime is 28747913. The reversal of 28747877 is 77874782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 77874782 = 2 ⋅38937391.

It is a cyclic number.

It is not a de Polignac number, because 28747877 - 2⁶ = 28747813 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 (28747837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1118 + ... + 7664.

It is an arithmetic number, because the mean of its divisors is an integer number (7189704).

Almost surely, 2^28747877 is an apocalyptic number.

It is an amenable number.

28747877 is a deficient number, since it is larger than the sum of its proper divisors (10939).

28747877 is an equidigital number, since it uses as much as digits as its factorization.

28747877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10938.

The product of its digits is 1229312, while the sum is 50.

The square root of 28747877 is about 5361.7046729562. The cubic root of 28747877 is about 306.3387430174.

The spelling of 28747877 in words is "twenty-eight million, seven hundred forty-seven thousand, eight hundred seventy-seven".