28251378506364 has 144 divisors (see below), whose sum is σ = 75821063949792. Its totient is φ = 8155252924416.

The previous prime is 28251378506359. The next prime is 28251378506411. The reversal of 28251378506364 is 46360587315282.

It is a junction number, because it is equal to n+sod(n) for n = 28251378506298 and 28251378506307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9481962 + ... + 12100014.

It is an arithmetic number, because the mean of its divisors is an integer number (526535166318).

Almost surely, 2^{28251378506364} 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 28251378506364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37910531974896).

28251378506364 is an abundant number, since it is smaller than the sum of its proper divisors (47569685443428).

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

28251378506364 is a wasteful number, since it uses less digits than its factorization.

28251378506364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618416 (or 2618401 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 60.

The spelling of 28251378506364 in words is "twenty-eight trillion, two hundred fifty-one billion, three hundred seventy-eight million, five hundred six thousand, three hundred sixty-four".