28720630356 has 192 divisors, whose sum is σ = 79915852800. Its totient is φ = 7930137600.

The previous prime is 28720630349. The next prime is 28720630397. The reversal of 28720630356 is 65303602782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24073696 + ... + 24074888.

It is an arithmetic number, because the mean of its divisors is an integer number (416228400).

Almost surely, 2^28720630356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28720630356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39957926400).

28720630356 is an abundant number, since it is smaller than the sum of its proper divisors (51195222444).

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

28720630356 is a wasteful number, since it uses less digits than its factorization.

28720630356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 28720630356 in words is "twenty-eight billion, seven hundred twenty million, six hundred thirty thousand, three hundred fifty-six".