28219387 has 8 divisors (see below), whose sum is σ = 32324096. Its totient is φ = 24133032.

The previous prime is 28219381. The next prime is 28219421. The reversal of 28219387 is 78391282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28219387 - 2¹⁹ = 27695099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28219381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (4040512).

Almost surely, 2^28219387 is an apocalyptic number.

28219387 is a deficient number, since it is larger than the sum of its proper divisors (4104709).

28219387 is an equidigital number, since it uses as much as digits as its factorization.

28219387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9177.

The product of its digits is 48384, while the sum is 40.

The square root of 28219387 is about 5312.1922969712. The cubic root of 28219387 is about 304.4499159522.

The spelling of 28219387 in words is "twenty-eight million, two hundred nineteen thousand, three hundred eighty-seven".