28161983 has 8 divisors (see below), whose sum is σ = 28619136. Its totient is φ = 27707800.

The previous prime is 28161961. The next prime is 28161997. The reversal of 28161983 is 38916182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28161983 - 2¹⁴ = 28145599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25268 + ... + 26358.

It is an arithmetic number, because the mean of its divisors is an integer number (3577392).

Almost surely, 2^28161983 is an apocalyptic number.

28161983 is a deficient number, since it is larger than the sum of its proper divisors (457153).

28161983 is a wasteful number, since it uses less digits than its factorization.

28161983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485.

The product of its digits is 20736, while the sum is 38.

The square root of 28161983 is about 5306.7865040908. The cubic root of 28161983 is about 304.2433380330.

The spelling of 28161983 in words is "twenty-eight million, one hundred sixty-one thousand, nine hundred eighty-three".