28109286660 has 432 divisors, whose sum is σ = 102891067776. Its totient is φ = 5613484032.

The previous prime is 28109286649. The next prime is 28109286683. The reversal of 28109286660 is 6668290182.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 25623232 + ... + 25624328.

It is an arithmetic number, because the mean of its divisors is an integer number (238173768).

Almost surely, 2^28109286660 is an apocalyptic number.

28109286660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28109286660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51445533888).

28109286660 is an abundant number, since it is smaller than the sum of its proper divisors (74781781116).

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

28109286660 is a wasteful number, since it uses less digits than its factorization.

28109286660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 28109286660 in words is "twenty-eight billion, one hundred nine million, two hundred eighty-six thousand, six hundred sixty".