28404268884 has 18 divisors (see below), whose sum is σ = 71799679770. Its totient is φ = 9468089616.

The previous prime is 28404268883. The next prime is 28404268931. The reversal of 28404268884 is 48886240482.

28404268884 is a `hidden beast` number, since 28 + 40 + 426 + 88 + 84 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22518003600 + 5886265284 = 150060^2 + 76722^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28404268884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404268883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394503699 + ... + 394503770.

Almost surely, 2^28404268884 is an apocalyptic number.

It is an amenable number.

28404268884 is an abundant number, since it is smaller than the sum of its proper divisors (43395410886).

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

28404268884 is a wasteful number, since it uses less digits than its factorization.

28404268884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789007479 (or 789007474 counting only the distinct ones).

The product of its (nonzero) digits is 6291456, while the sum is 54.

It can be divided in two parts, 2840 and 4268884, that added together give a palindrome (4271724).

The spelling of 28404268884 in words is "twenty-eight billion, four hundred four million, two hundred sixty-eight thousand, eight hundred eighty-four".