28255638281 has 16 divisors (see below), whose sum is σ = 31255357056. Its totient is φ = 25378569216.

The previous prime is 28255638259. The next prime is 28255638349. The reversal of 28255638281 is 18283655282.

It is not a de Polignac number, because 28255638281 - 2²² = 28251443977 is a prime.

It is a super-2 number, since 2×28255638281² (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 (28255638221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50921 + ... + 243113.

It is an arithmetic number, because the mean of its divisors is an integer number (1953459816).

Almost surely, 2^28255638281 is an apocalyptic number.

It is an amenable number.

28255638281 is a deficient number, since it is larger than the sum of its proper divisors (2999718775).

28255638281 is a wasteful number, since it uses less digits than its factorization.

28255638281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192512.

The product of its digits is 1843200, while the sum is 50.

The spelling of 28255638281 in words is "twenty-eight billion, two hundred fifty-five million, six hundred thirty-eight thousand, two hundred eighty-one".