28386629281 has 4 divisors (see below), whose sum is σ = 28387307200. Its totient is φ = 28385951364.

The previous prime is 28386629263. The next prime is 28386629347. The reversal of 28386629281 is 18292668382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28386629281 - 2⁷ = 28386629153 is a prime.

It is a super-2 number, since 2×28386629281² (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 (28386629081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271701 + ... + 361378.

It is an arithmetic number, because the mean of its divisors is an integer number (7096826800).

Almost surely, 2^28386629281 is an apocalyptic number.

It is an amenable number.

28386629281 is a deficient number, since it is larger than the sum of its proper divisors (677919).

28386629281 is an equidigital number, since it uses as much as digits as its factorization.

28386629281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677918.

The product of its digits is 3981312, while the sum is 55.

The spelling of 28386629281 in words is "twenty-eight billion, three hundred eighty-six million, six hundred twenty-nine thousand, two hundred eighty-one".