28239720788500 has 192 divisors, whose sum is σ = 66717164666880. Its totient is φ = 10380361766400.

The previous prime is 28239720788497. The next prime is 28239720788509. The reversal of 28239720788500 is 588702793282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239720788509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2302833369 + ... + 2302845631.

It is an arithmetic number, because the mean of its divisors is an integer number (347485232640).

Almost surely, 2^{28239720788500} is an apocalyptic number.

28239720788500 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 28239720788500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33358582333440).

28239720788500 is an abundant number, since it is smaller than the sum of its proper divisors (38477443878380).

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

28239720788500 is a wasteful number, since it uses less digits than its factorization.

28239720788500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13851 (or 13839 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 28239720788500 in words is "twenty-eight trillion, two hundred thirty-nine billion, seven hundred twenty million, seven hundred eighty-eight thousand, five hundred".