28404877 has 4 divisors (see below), whose sum is σ = 28448640. Its totient is φ = 28361116.

The previous prime is 28404853. The next prime is 28404881. The reversal of 28404877 is 77840482.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 77840482 = 2 ⋅38920241.

It is a cyclic number.

It is not a de Polignac number, because 28404877 - 2⁷ = 28404749 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 (28404377) 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, 20893 + ... + 22210.

It is an arithmetic number, because the mean of its divisors is an integer number (7112160).

Almost surely, 2^28404877 is an apocalyptic number.

It is an amenable number.

28404877 is a deficient number, since it is larger than the sum of its proper divisors (43763).

28404877 is an equidigital number, since it uses as much as digits as its factorization.

28404877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43762.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 28404877 is about 5329.6225945183. The cubic root of 28404877 is about 305.1155237377.

The spelling of 28404877 in words is "twenty-eight million, four hundred four thousand, eight hundred seventy-seven".