28851649 has 4 divisors (see below), whose sum is σ = 29340720. Its totient is φ = 28362580.

The previous prime is 28851619. The next prime is 28851653. The reversal of 28851649 is 94615882.

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 28851649 - 2⁷ = 28851521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28851619) 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, 244447 + ... + 244564.

It is an arithmetic number, because the mean of its divisors is an integer number (7335180).

Almost surely, 2^28851649 is an apocalyptic number.

It is an amenable number.

28851649 is a deficient number, since it is larger than the sum of its proper divisors (489071).

28851649 is an equidigital number, since it uses as much as digits as its factorization.

28851649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489070.

The product of its digits is 138240, while the sum is 43.

The square root of 28851649 is about 5371.3731019172. The cubic root of 28851649 is about 306.7069001771.

The spelling of 28851649 in words is "twenty-eight million, eight hundred fifty-one thousand, six hundred forty-nine".