28710562881 has 32 divisors (see below), whose sum is σ = 51397936128. Its totient is φ = 13767301440.

The previous prime is 28710562847. The next prime is 28710562891. The reversal of 28710562881 is 18826501782.

It is not a de Polignac number, because 28710562881 - 2⁷ = 28710562753 is a prime.

It is a super-2 number, since 2×28710562881² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28710562881.

It is not an unprimeable number, because it can be changed into a prime (28710562841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4777311 + ... + 4783316.

It is an arithmetic number, because the mean of its divisors is an integer number (1606185504).

Almost surely, 2^28710562881 is an apocalyptic number.

28710562881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28710562881 is a deficient number, since it is larger than the sum of its proper divisors (22687373247).

28710562881 is a wasteful number, since it uses less digits than its factorization.

28710562881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560661.

The product of its (nonzero) digits is 430080, while the sum is 48.

The spelling of 28710562881 in words is "twenty-eight billion, seven hundred ten million, five hundred sixty-two thousand, eight hundred eighty-one".