28191037056 has 256 divisors, whose sum is σ = 93124335360. Its totient is φ = 7357464576.

The previous prime is 28191037037. The next prime is 28191037081. The reversal of 28191037056 is 65073019182.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28191036999 and 28191037017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3385410 + ... + 3393726.

It is an arithmetic number, because the mean of its divisors is an integer number (363766935).

Almost surely, 2^28191037056 is an apocalyptic number.

28191037056 is a gapful number since it is divisible by the number (26) 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 28191037056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46562167680).

28191037056 is an abundant number, since it is smaller than the sum of its proper divisors (64933298304).

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

28191037056 is a wasteful number, since it uses less digits than its factorization.

28191037056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8451 (or 8439 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 28191037056 in words is "twenty-eight billion, one hundred ninety-one million, thirty-seven thousand, fifty-six".