28019484 has 18 divisors (see below), whose sum is σ = 70827120. Its totient is φ = 9339816.

The previous prime is 28019477. The next prime is 28019489. The reversal of 28019484 is 48491082.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 778319 = 28019484 / (2 + 8 + 0 + 1 + 9 + 4 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28019489) 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 5 ways as a sum of consecutive naturals, for example, 389124 + ... + 389195.

It is an arithmetic number, because the mean of its divisors is an integer number (3934840).

Almost surely, 2^28019484 is an apocalyptic number.

It is an amenable number.

28019484 is an abundant number, since it is smaller than the sum of its proper divisors (42807636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28019484 is a wasteful number, since it uses less digits than its factorization.

28019484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778329 (or 778324 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28019484 is about 5293.3433669090. The cubic root of 28019484 is about 303.7293152607.

The spelling of 28019484 in words is "twenty-eight million, nineteen thousand, four hundred eighty-four".