28347227520 has 128 divisors (see below), whose sum is σ = 91201904640. Its totient is φ = 7488559104.

The previous prime is 28347227509. The next prime is 28347227527. The reversal of 28347227520 is 2572274382.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28347227527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136449 + ... + 274431.

It is an arithmetic number, because the mean of its divisors is an integer number (712514880).

Almost surely, 2^28347227520 is an apocalyptic number.

28347227520 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 28347227520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45600952320).

28347227520 is an abundant number, since it is smaller than the sum of its proper divisors (62854677120).

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

28347227520 is a wasteful number, since it uses less digits than its factorization.

28347227520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138112 (or 138100 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 42.

The spelling of 28347227520 in words is "twenty-eight billion, three hundred forty-seven million, two hundred twenty-seven thousand, five hundred twenty".