28027561311880 has 64 divisors (see below), whose sum is σ = 67947015270960. Its totient is φ = 10343445147648.

The previous prime is 28027561311859. The next prime is 28027561311881. The reversal of 28027561311880 is 8811316572082.

It can be written as a sum of positive squares in 8 ways, for example, as 4206543572196 + 23821017739684 = 2050986^2 + 4880678^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (28027561311881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12485757 + ... + 14558476.

Almost surely, 2^{28027561311880} is an apocalyptic number.

28027561311880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28027561311880 is an abundant number, since it is smaller than the sum of its proper divisors (39919453959080).

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

28027561311880 is a wasteful number, since it uses less digits than its factorization.

28027561311880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27046250 (or 27046246 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 28027561311880 in words is "twenty-eight trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, eight hundred eighty".