28072811520 has 880 divisors, whose sum is σ = 111851486208. Its totient is φ = 6688604160.

The previous prime is 28072811491. The next prime is 28072811537. The reversal of 28072811520 is 2511827082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 221045697 + ... + 221045823.

Almost surely, 2^28072811520 is an apocalyptic number.

28072811520 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 28072811520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55925743104).

28072811520 is an abundant number, since it is smaller than the sum of its proper divisors (83778674688).

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

28072811520 is a wasteful number, since it uses less digits than its factorization.

28072811520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The spelling of 28072811520 in words is "twenty-eight billion, seventy-two million, eight hundred eleven thousand, five hundred twenty".