28145651520 has 448 divisors, whose sum is σ = 113836216320. Its totient is φ = 5735743488.

The previous prime is 28145651477. The next prime is 28145651543. The reversal of 28145651520 is 2515654182.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

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, 2164077 + ... + 2177043.

Almost surely, 2^28145651520 is an apocalyptic number.

28145651520 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 28145651520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56918108160).

28145651520 is an abundant number, since it is smaller than the sum of its proper divisors (85690564800).

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

28145651520 is a wasteful number, since it uses less digits than its factorization.

28145651520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13030 (or 13020 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The spelling of 28145651520 in words is "twenty-eight billion, one hundred forty-five million, six hundred fifty-one thousand, five hundred twenty".