28553237856 has 384 divisors, whose sum is σ = 99523468800. Its totient is φ = 7849543680.

The previous prime is 28553237831. The next prime is 28553237863. The reversal of 28553237856 is 65873235582.

28553237856 is a `hidden beast` number, since 2 + 8 + 553 + 2 + 3 + 7 + 85 + 6 = 666.

It is a super-2 number, since 2×28553237856² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7287610 + ... + 7291526.

It is an arithmetic number, because the mean of its divisors is an integer number (259175700).

Almost surely, 2^28553237856 is an apocalyptic number.

28553237856 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 28553237856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49761734400).

28553237856 is an abundant number, since it is smaller than the sum of its proper divisors (70970230944).

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

28553237856 is a wasteful number, since it uses less digits than its factorization.

28553237856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019 (or 4005 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The spelling of 28553237856 in words is "twenty-eight billion, five hundred fifty-three million, two hundred thirty-seven thousand, eight hundred fifty-six".