28756658880 has 392 divisors, whose sum is σ = 103561889904. Its totient is φ = 7601817600.

The previous prime is 28756658837. The next prime is 28756658893. The reversal of 28756658880 is 8885665782.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 30559210 + ... + 30560150.

Almost surely, 2^28756658880 is an apocalyptic number.

28756658880 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 28756658880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51780944952).

28756658880 is an abundant number, since it is smaller than the sum of its proper divisors (74805231024).

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

28756658880 is an equidigital number, since it uses as much as digits as its factorization.

28756658880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 63.

The spelling of 28756658880 in words is "twenty-eight billion, seven hundred fifty-six million, six hundred fifty-eight thousand, eight hundred eighty".