28309403520 has 192 divisors, whose sum is σ = 98994916800. Its totient is φ = 7453495296.

The previous prime is 28309403509. The next prime is 28309403557. The reversal of 28309403520 is 2530490382.

It is a tau number, because it is divible by the number of its divisors (192).

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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423934 + ... + 486146.

It is an arithmetic number, because the mean of its divisors is an integer number (515598525).

Almost surely, 2^28309403520 is an apocalyptic number.

28309403520 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 28309403520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49497458400).

28309403520 is an abundant number, since it is smaller than the sum of its proper divisors (70685513280).

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

28309403520 is a wasteful number, since it uses less digits than its factorization.

28309403520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62317 (or 62302 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 28309403520 in words is "twenty-eight billion, three hundred nine million, four hundred three thousand, five hundred twenty".