28887128025840 has 960 divisors, whose sum is σ = 120801453926400. Its totient is φ = 6040847425536.

The previous prime is 28887128025781. The next prime is 28887128025859. The reversal of 28887128025840 is 4852082178882.

28887128025840 is a `hidden beast` number, since 28 + 8 + 8 + 7 + 1 + 28 + 0 + 2 + 584 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 359659606 + ... + 359739914.

It is an arithmetic number, because the mean of its divisors is an integer number (125834847840).

Almost surely, 2^{28887128025840} is an apocalyptic number.

28887128025840 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 28887128025840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60400726963200).

28887128025840 is an abundant number, since it is smaller than the sum of its proper divisors (91914325900560).

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

28887128025840 is a wasteful number, since it uses less digits than its factorization.

28887128025840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80494 (or 80485 counting only the distinct ones).

The product of its (nonzero) digits is 36700160, while the sum is 63.

The spelling of 28887128025840 in words is "twenty-eight trillion, eight hundred eighty-seven billion, one hundred twenty-eight million, twenty-five thousand, eight hundred forty".