28385726056820 has 24 divisors (see below), whose sum is σ = 65029117876128. Its totient is φ = 10322082202400.

The previous prime is 28385726056789. The next prime is 28385726056847. The reversal of 28385726056820 is 2865062758382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64513013546 + ... + 64513013985.

It is an arithmetic number, because the mean of its divisors is an integer number (2709546578172).

Almost surely, 2^{28385726056820} is an apocalyptic number.

28385726056820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28385726056820 is an abundant number, since it is smaller than the sum of its proper divisors (36643391819308).

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

28385726056820 is a wasteful number, since it uses less digits than its factorization.

28385726056820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129026027551 (or 129026027549 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 62.

The spelling of 28385726056820 in words is "twenty-eight trillion, three hundred eighty-five billion, seven hundred twenty-six million, fifty-six thousand, eight hundred twenty".