28489042440 has 128 divisors (see below), whose sum is σ = 97530192000. Its totient is φ = 7391741184.

The previous prime is 28489042409. The next prime is 28489042441. The reversal of 28489042440 is 4424098482.

28489042440 is a `hidden beast` number, since 2 + 84 + 8 + 90 + 42 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28489042441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316510 + ... + 396429.

It is an arithmetic number, because the mean of its divisors is an integer number (761954625).

Almost surely, 2^28489042440 is an apocalyptic number.

28489042440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28489042440 is an abundant number, since it is smaller than the sum of its proper divisors (69041149560).

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

28489042440 is a wasteful number, since it uses less digits than its factorization.

28489042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712996 (or 712986 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 28489042440 in words is "twenty-eight billion, four hundred eighty-nine million, forty-two thousand, four hundred forty".