28361812500 has 504 divisors, whose sum is σ = 107229877440. Its totient is φ = 6482700000.

The previous prime is 28361812499. The next prime is 28361812513. The reversal of 28361812500 is 521816382.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

28361812500 is a `hidden beast` number, since 2 + 83 + 61 + 8 + 12 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 167 ways as a sum of consecutive naturals, for example, 4051687497 + ... + 4051687503.

Almost surely, 2^28361812500 is an apocalyptic number.

28361812500 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 28361812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53614938720).

28361812500 is an abundant number, since it is smaller than the sum of its proper divisors (78868064940).

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

28361812500 is an frugal number, since it uses more digits than its factorization.

28361812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 28361812500 in words is "twenty-eight billion, three hundred sixty-one million, eight hundred twelve thousand, five hundred".