28219378 has 24 divisors (see below), whose sum is σ = 48143340. Its totient is φ = 12381600.

The previous prime is 28219361. The next prime is 28219381. The reversal of 28219378 is 87391282.

It can be written as a sum of positive squares in 2 ways, for example, as 26388769 + 1830609 = 5137^2 + 1353^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28219378.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5008 + ... + 9028.

Almost surely, 2^28219378 is an apocalyptic number.

28219378 is a deficient number, since it is larger than the sum of its proper divisors (19923962).

28219378 is a wasteful number, since it uses less digits than its factorization.

28219378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074 (or 4063 counting only the distinct ones).

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

The square root of 28219378 is about 5312.1914498632. The cubic root of 28219378 is about 304.4498835861.

The spelling of 28219378 in words is "twenty-eight million, two hundred nineteen thousand, three hundred seventy-eight".