28887243840 has 1120 divisors, whose sum is σ = 130280688384. Its totient is φ = 5912248320.

The previous prime is 28887243821. The next prime is 28887243841. The reversal of 28887243840 is 4834278882.

28887243840 is a `hidden beast` number, since 28 + 88 + 72 + 438 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28887243841) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 87272475 + ... + 87272805.

Almost surely, 2^28887243840 is an apocalyptic number.

28887243840 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 28887243840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65140344192).

28887243840 is an abundant number, since it is smaller than the sum of its proper divisors (101393444544).

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

28887243840 is a wasteful number, since it uses less digits than its factorization.

28887243840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 54.

The spelling of 28887243840 in words is "twenty-eight billion, eight hundred eighty-seven million, two hundred forty-three thousand, eight hundred forty".