28987453440 has 936 divisors, whose sum is σ = 120199714128. Its totient is φ = 6385827840.

The previous prime is 28987453427. The next prime is 28987453447. The reversal of 28987453440 is 4435478982.

28987453440 is a `hidden beast` number, since 2 + 89 + 8 + 74 + 53 + 440 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987453447) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 999567346 + ... + 999567374.

It is an arithmetic number, because the mean of its divisors is an integer number (128418498).

Almost surely, 2^28987453440 is an apocalyptic number.

28987453440 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 28987453440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60099857064).

28987453440 is an abundant number, since it is smaller than the sum of its proper divisors (91212260688).

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

28987453440 is a wasteful number, since it uses less digits than its factorization.

28987453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 28987453440 in words is "twenty-eight billion, nine hundred eighty-seven million, four hundred fifty-three thousand, four hundred forty".