28487888640 has 432 divisors, whose sum is σ = 104539562400. Its totient is φ = 7142473728.

The previous prime is 28487888633. The next prime is 28487888717. The reversal of 28487888640 is 4688878482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34363746 + ... + 34364574.

Almost surely, 2^28487888640 is an apocalyptic number.

28487888640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28487888640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52269781200).

28487888640 is an abundant number, since it is smaller than the sum of its proper divisors (76051673760).

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

28487888640 is a wasteful number, since it uses less digits than its factorization.

28487888640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 44040192, while the sum is 63.

The spelling of 28487888640 in words is "twenty-eight billion, four hundred eighty-seven million, eight hundred eighty-eight thousand, six hundred forty".