28394858493820 has 192 divisors, whose sum is σ = 76824214290432. Its totient is φ = 8574128640000.

The previous prime is 28394858493787. The next prime is 28394858493917. The reversal of 28394858493820 is 2839485849382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 461620 + ... + 7550020.

It is an arithmetic number, because the mean of its divisors is an integer number (400126116096).

Almost surely, 2^{28394858493820} is an apocalyptic number.

28394858493820 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 28394858493820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38412107145216).

28394858493820 is an abundant number, since it is smaller than the sum of its proper divisors (48429355796612).

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

28394858493820 is a wasteful number, since it uses less digits than its factorization.

28394858493820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088532 (or 7088530 counting only the distinct ones).

The product of its (nonzero) digits is 955514880, while the sum is 73.

The spelling of 28394858493820 in words is "twenty-eight trillion, three hundred ninety-four billion, eight hundred fifty-eight million, four hundred ninety-three thousand, eight hundred twenty".