28164208281 has 8 divisors (see below), whose sum is σ = 40966121184. Its totient is φ = 17069217120.

The previous prime is 28164208279. The next prime is 28164208291. The reversal of 28164208281 is 18280246182.

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

It is not a de Polignac number, because 28164208281 - 2¹ = 28164208279 is a prime.

It is a super-2 number, since 2×28164208281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28164208291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426730396 + ... + 426730461.

It is an arithmetic number, because the mean of its divisors is an integer number (5120765148).

Almost surely, 2^28164208281 is an apocalyptic number.

It is an amenable number.

28164208281 is a deficient number, since it is larger than the sum of its proper divisors (12801912903).

28164208281 is a wasteful number, since it uses less digits than its factorization.

28164208281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853460871.

The product of its (nonzero) digits is 98304, while the sum is 42.

The spelling of 28164208281 in words is "twenty-eight billion, one hundred sixty-four million, two hundred eight thousand, two hundred eighty-one".