28219851 has 12 divisors (see below), whose sum is σ = 44467800. Its totient is φ = 17102880.

The previous prime is 28219843. The next prime is 28219861. The reversal of 28219851 is 15891282.

It is not a de Polignac number, because 28219851 - 2³ = 28219843 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28219831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142426 + ... + 142623.

It is an arithmetic number, because the mean of its divisors is an integer number (3705650).

Almost surely, 2^28219851 is an apocalyptic number.

28219851 is a deficient number, since it is larger than the sum of its proper divisors (16247949).

28219851 is a wasteful number, since it uses less digits than its factorization.

28219851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285066 (or 285063 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 28219851 is about 5312.2359699095. The cubic root of 28219851 is about 304.4515845921.

The spelling of 28219851 in words is "twenty-eight million, two hundred nineteen thousand, eight hundred fifty-one".