28129139250 has 64 divisors (see below), whose sum is σ = 74340384768. Its totient is φ = 7059859200.

The previous prime is 28129139249. The next prime is 28129139263. The reversal of 28129139250 is 5293192182.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1090354 + ... + 1115853.

It is an arithmetic number, because the mean of its divisors is an integer number (1161568512).

Almost surely, 2^28129139250 is an apocalyptic number.

28129139250 is an abundant number, since it is smaller than the sum of its proper divisors (46211245518).

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

28129139250 is a wasteful number, since it uses less digits than its factorization.

28129139250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206244 (or 2206234 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 28129139250 in words is "twenty-eight billion, one hundred twenty-nine million, one hundred thirty-nine thousand, two hundred fifty".