28777849 has 4 divisors (see below), whose sum is σ = 28854160. Its totient is φ = 28701540.

The previous prime is 28777817. The next prime is 28777877. The reversal of 28777849 is 94877782.

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.

It is a cyclic number.

It is not a de Polignac number, because 28777849 - 2⁵ = 28777817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28777796 and 28777805.

It is not an unprimeable number, because it can be changed into a prime (28777249) 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, 37587 + ... + 38344.

It is an arithmetic number, because the mean of its divisors is an integer number (7213540).

Almost surely, 2^28777849 is an apocalyptic number.

It is an amenable number.

28777849 is a deficient number, since it is larger than the sum of its proper divisors (76311).

28777849 is an equidigital number, since it uses as much as digits as its factorization.

28777849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76310.

The product of its digits is 1580544, while the sum is 52.

The square root of 28777849 is about 5364.4989514399. The cubic root of 28777849 is about 306.4451670594.

The spelling of 28777849 in words is "twenty-eight million, seven hundred seventy-seven thousand, eight hundred forty-nine".