28190927281 has 16 divisors (see below), whose sum is σ = 31768201728. Its totient is φ = 24783897600.

The previous prime is 28190927279. The next prime is 28190927287. The reversal of 28190927281 is 18272909182.

It is not a de Polignac number, because 28190927281 - 2¹ = 28190927279 is a prime.

It is a super-2 number, since 2×28190927281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28190927287) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 467025 + ... + 523921.

It is an arithmetic number, because the mean of its divisors is an integer number (1985512608).

Almost surely, 2^28190927281 is an apocalyptic number.

It is an amenable number.

28190927281 is a deficient number, since it is larger than the sum of its proper divisors (3577274447).

28190927281 is a wasteful number, since it uses less digits than its factorization.

28190927281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58392.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 28190927281 in words is "twenty-eight billion, one hundred ninety million, nine hundred twenty-seven thousand, two hundred eighty-one".