28487989872 has 320 divisors, whose sum is σ = 87851520000. Its totient is φ = 8812945152.

The previous prime is 28487989841. The next prime is 28487989889. The reversal of 28487989872 is 27898978482.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 28487989872.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 143155629 + ... + 143155827.

It is an arithmetic number, because the mean of its divisors is an integer number (274536000).

Almost surely, 2^28487989872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28487989872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43925760000).

28487989872 is an abundant number, since it is smaller than the sum of its proper divisors (59363530128).

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

28487989872 is a wasteful number, since it uses less digits than its factorization.

28487989872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 493 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 72.

The spelling of 28487989872 in words is "twenty-eight billion, four hundred eighty-seven million, nine hundred eighty-nine thousand, eight hundred seventy-two".