28455408520 has 256 divisors, whose sum is σ = 88969881600. Its totient is φ = 7907880960.

The previous prime is 28455408517. The next prime is 28455408523. The reversal of 28455408520 is 2580455482.

It is an interprime number because it is at equal distance from previous prime (28455408517) and next prime (28455408523).

It is not an unprimeable number, because it can be changed into a prime (28455408523) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 980539 + ... + 1009141.

It is an arithmetic number, because the mean of its divisors is an integer number (347538600).

Almost surely, 2^28455408520 is an apocalyptic number.

28455408520 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 28455408520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44484940800).

28455408520 is an abundant number, since it is smaller than the sum of its proper divisors (60514473080).

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

28455408520 is a wasteful number, since it uses less digits than its factorization.

28455408520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28668 (or 28664 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 43.

The spelling of 28455408520 in words is "twenty-eight billion, four hundred fifty-five million, four hundred eight thousand, five hundred twenty".