28640208266660 has 24 divisors (see below), whose sum is σ = 60144574451640. Its totient is φ = 11456057193984.

The previous prime is 28640208266609. The next prime is 28640208266687. The reversal of 28640208266660 is 6666280204682.

It can be written as a sum of positive squares in 4 ways, for example, as 2453489915044 + 26186718351616 = 1566362^2 + 5117296^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28640208266596 and 28640208266605.

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, 9074882 + ... + 11816678.

It is an arithmetic number, because the mean of its divisors is an integer number (2506023935485).

Almost surely, 2^{28640208266660} is an apocalyptic number.

28640208266660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28640208266660 is an abundant number, since it is smaller than the sum of its proper divisors (31504366184980).

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

28640208266660 is a wasteful number, since it uses less digits than its factorization.

28640208266660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264095 (or 3264093 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 56.

The spelling of 28640208266660 in words is "twenty-eight trillion, six hundred forty billion, two hundred eight million, two hundred sixty-six thousand, six hundred sixty".