28261778616180 has 96 divisors (see below), whose sum is σ = 88309488153600. Its totient is φ = 7503563896704.

The previous prime is 28261778616161. The next prime is 28261778616191. The reversal of 28261778616180 is 8161687716282.

It is a happy number.

28261778616180 is a `hidden beast` number, since 2 + 8 + 2 + 6 + 1 + 7 + 7 + 8 + 6 + 1 + 618 + 0 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114148452 + ... + 114395771.

It is an arithmetic number, because the mean of its divisors is an integer number (919890501600).

Almost surely, 2^{28261778616180} is an apocalyptic number.

28261778616180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28261778616180 is an abundant number, since it is smaller than the sum of its proper divisors (60047709537420).

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

28261778616180 is a wasteful number, since it uses less digits than its factorization.

28261778616180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228544470 (or 228544462 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 63.

The spelling of 28261778616180 in words is "twenty-eight trillion, two hundred sixty-one billion, seven hundred seventy-eight million, six hundred sixteen thousand, one hundred eighty".