28642849 has 4 divisors (see below), whose sum is σ = 28818736. Its totient is φ = 28466964.

The previous prime is 28642837. The next prime is 28642871. The reversal of 28642849 is 94824682.

28642849 is nontrivially palindromic in base 7.

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 28642849 - 2⁷ = 28642721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28642819) 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, 87699 + ... + 88024.

It is an arithmetic number, because the mean of its divisors is an integer number (7204684).

Almost surely, 2^28642849 is an apocalyptic number.

It is an amenable number.

28642849 is a deficient number, since it is larger than the sum of its proper divisors (175887).

28642849 is a wasteful number, since it uses less digits than its factorization.

28642849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175886.

The product of its digits is 221184, while the sum is 43.

The square root of 28642849 is about 5351.9014378069. The cubic root of 28642849 is about 305.9652266579.

The spelling of 28642849 in words is "twenty-eight million, six hundred forty-two thousand, eight hundred forty-nine".