28147489920 has 384 divisors, whose sum is σ = 107543479680. Its totient is φ = 6726451200.

The previous prime is 28147489901. The next prime is 28147489949. The reversal of 28147489920 is 2998474182.

28147489920 is a `hidden beast` number, since 2 + 8 + 1 + 474 + 89 + 92 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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, 4495432 + ... + 4501688.

It is an arithmetic number, because the mean of its divisors is an integer number (280061145).

Almost surely, 2^28147489920 is an apocalyptic number.

28147489920 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 28147489920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53771739840).

28147489920 is an abundant number, since it is smaller than the sum of its proper divisors (79395989760).

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

28147489920 is a wasteful number, since it uses less digits than its factorization.

28147489920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364 (or 6349 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 28147489920 in words is "twenty-eight billion, one hundred forty-seven million, four hundred eighty-nine thousand, nine hundred twenty".