28515149845896 has 1024 divisors, whose sum is σ = 90229084323840. Its totient is φ = 7338885120000.

The previous prime is 28515149845807. The next prime is 28515149845957. The reversal of 28515149845896 is 69854894151582.

It is a super-2 number, since 2×28515149845896² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 89953153930 + ... + 89953154246.

It is an arithmetic number, because the mean of its divisors is an integer number (88114340160).

Almost surely, 2^{28515149845896} 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 28515149845896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45114542161920).

28515149845896 is an abundant number, since it is smaller than the sum of its proper divisors (61713934477944).

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

28515149845896 is a wasteful number, since it uses less digits than its factorization.

28515149845896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 642 counting only the distinct ones).

The product of its digits is 995328000, while the sum is 75.

The spelling of 28515149845896 in words is "twenty-eight trillion, five hundred fifteen billion, one hundred forty-nine million, eight hundred forty-five thousand, eight hundred ninety-six".