28061658660 has 96 divisors (see below), whose sum is σ = 90028673280. Its totient is φ = 6397567488.

The previous prime is 28061658637. The next prime is 28061658671. The reversal of 28061658660 is 6685616082.

It is a happy 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, 77502 + ... + 249258.

It is an arithmetic number, because the mean of its divisors is an integer number (937798680).

Almost surely, 2^28061658660 is an apocalyptic number.

28061658660 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 28061658660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45014336640).

28061658660 is an abundant number, since it is smaller than the sum of its proper divisors (61967014620).

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

28061658660 is a wasteful number, since it uses less digits than its factorization.

28061658660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172165 (or 172163 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 28061658660 in words is "twenty-eight billion, sixty-one million, six hundred fifty-eight thousand, six hundred sixty".