28555511078280 has 64 divisors (see below), whose sum is σ = 85675305974400. Its totient is φ = 7614023155200.

The previous prime is 28555511078279. The next prime is 28555511078317. The reversal of 28555511078280 is 8287011555582.

It is a self number, because there is not a number n which added to its sum of digits gives 28555511078280.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11007196 + ... + 13351755.

It is an arithmetic number, because the mean of its divisors is an integer number (1338676655850).

Almost surely, 2^{28555511078280} is an apocalyptic number.

28555511078280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28555511078280 is an abundant number, since it is smaller than the sum of its proper divisors (57119794896120).

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

28555511078280 is a wasteful number, since it uses less digits than its factorization.

28555511078280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24368734 (or 24368730 counting only the distinct ones).

The product of its (nonzero) digits is 8960000, while the sum is 57.

The spelling of 28555511078280 in words is "twenty-eight trillion, five hundred fifty-five billion, five hundred eleven million, seventy-eight thousand, two hundred eighty".