28105103520 has 384 divisors, whose sum is σ = 107143948800. Its totient is φ = 6839230464.

The previous prime is 28105103513. The next prime is 28105103561. The reversal of 28105103520 is 2530150182.

It is a happy number.

28105103520 is a `hidden beast` number, since 28 + 10 + 5 + 103 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4995429 + ... + 5001051.

It is an arithmetic number, because the mean of its divisors is an integer number (279020700).

Almost surely, 2^28105103520 is an apocalyptic number.

28105103520 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 28105103520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53571974400).

28105103520 is an abundant number, since it is smaller than the sum of its proper divisors (79038845280).

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

28105103520 is a wasteful number, since it uses less digits than its factorization.

28105103520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749 (or 5735 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 28105103520 in words is "twenty-eight billion, one hundred five million, one hundred three thousand, five hundred twenty".