28144021407381 has 192 divisors, whose sum is σ = 47838015313920. Its totient is φ = 15763896000000.

The previous prime is 28144021407377. The next prime is 28144021407389. The reversal of 28144021407381 is 18370412044182.

28144021407381 is a `hidden beast` number, since 2 + 8 + 1 + 440 + 21 + 40 + 73 + 81 = 666.

It is not a de Polignac number, because 28144021407381 - 2² = 28144021407377 is a prime.

It is a super-2 number, since 2×28144021407381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28144021407389) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18382769586 + ... + 18382771116.

It is an arithmetic number, because the mean of its divisors is an integer number (249156329760).

Almost surely, 2^{28144021407381} is an apocalyptic number.

It is an amenable number.

28144021407381 is a deficient number, since it is larger than the sum of its proper divisors (19693993906539).

28144021407381 is a wasteful number, since it uses less digits than its factorization.

28144021407381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840 (or 2837 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 28144021407381 in words is "twenty-eight trillion, one hundred forty-four billion, twenty-one million, four hundred seven thousand, three hundred eighty-one".