28177981650 has 768 divisors, whose sum is σ = 101326848000. Its totient is φ = 5715360000.

The previous prime is 28177981621. The next prime is 28177981669. The reversal of 28177981650 is 5618977182.

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 (17) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 186609075 + ... + 186609225.

It is an arithmetic number, because the mean of its divisors is an integer number (131936000).

Almost surely, 2^28177981650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28177981650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50663424000).

28177981650 is an abundant number, since it is smaller than the sum of its proper divisors (73148866350).

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

28177981650 is a wasteful number, since it uses less digits than its factorization.

28177981650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 28177981650 in words is "twenty-eight billion, one hundred seventy-seven million, nine hundred eighty-one thousand, six hundred fifty".