28219049864 has 16 divisors (see below), whose sum is σ = 53505222300. Its totient is φ = 13950990592.

The previous prime is 28219049827. The next prime is 28219049867. The reversal of 28219049864 is 46894091282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28207202500 + 11847364 = 167950^2 + 3442^2 .

It is not an unprimeable number, because it can be changed into a prime (28219049867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19816037 + ... + 19817460.

Almost surely, 2^28219049864 is an apocalyptic number.

It is an amenable number.

28219049864 is a deficient number, since it is larger than the sum of its proper divisors (25286172436).

28219049864 is a wasteful number, since it uses less digits than its factorization.

28219049864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39633592 (or 39633588 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 28219049864 in words is "twenty-eight billion, two hundred nineteen million, forty-nine thousand, eight hundred sixty-four".