28303722540 has 192 divisors, whose sum is σ = 89573299200. Its totient is φ = 7418138112.

The previous prime is 28303722493. The next prime is 28303722583. The reversal of 28303722540 is 4522730382.

28303722540 is a `hidden beast` number, since 2 + 8 + 30 + 372 + 254 + 0 = 666.

It is a super-2 number, since 2×28303722540² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 28303722495 and 28303722504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29269137 + ... + 29270103.

It is an arithmetic number, because the mean of its divisors is an integer number (466527600).

Almost surely, 2^28303722540 is an apocalyptic number.

28303722540 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 28303722540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44786649600).

28303722540 is an abundant number, since it is smaller than the sum of its proper divisors (61269576660).

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

28303722540 is a wasteful number, since it uses less digits than its factorization.

28303722540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 28303722540 in words is "twenty-eight billion, three hundred three million, seven hundred twenty-two thousand, five hundred forty".