28138850250 has 192 divisors, whose sum is σ = 82358415360. Its totient is φ = 6380035200.

The previous prime is 28138850239. The next prime is 28138850293. The reversal of 28138850250 is 5205883182.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4664236 + ... + 4670264.

It is an arithmetic number, because the mean of its divisors is an integer number (428950080).

Almost surely, 2^28138850250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28138850250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41179207680).

28138850250 is an abundant number, since it is smaller than the sum of its proper divisors (54219565110).

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

28138850250 is a wasteful number, since it uses less digits than its factorization.

28138850250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190 (or 6173 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 28138850250 in words is "twenty-eight billion, one hundred thirty-eight million, eight hundred fifty thousand, two hundred fifty".