28438163520 has 448 divisors, whose sum is σ = 100374785280. Its totient is φ = 6777372672.

The previous prime is 28438163513. The next prime is 28438163573. The reversal of 28438163520 is 2536183482.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 105717946 + ... + 105718214.

It is an arithmetic number, because the mean of its divisors is an integer number (224050860).

Almost surely, 2^28438163520 is an apocalyptic number.

28438163520 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 28438163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50187392640).

28438163520 is an abundant number, since it is smaller than the sum of its proper divisors (71936621760).

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

28438163520 is a wasteful number, since it uses less digits than its factorization.

28438163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 28438163520 in words is "twenty-eight billion, four hundred thirty-eight million, one hundred sixty-three thousand, five hundred twenty".