28814547881 has 4 divisors (see below), whose sum is σ = 32930911872. Its totient is φ = 24698183892.

The previous prime is 28814547863. The next prime is 28814547917. The reversal of 28814547881 is 18874541882.

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 28814547881 - 2³⁴ = 11634678697 is a prime.

It is a super-2 number, since 2×28814547881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28814507881) 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, 2058181985 + ... + 2058181998.

It is an arithmetic number, because the mean of its divisors is an integer number (8232727968).

Almost surely, 2^28814547881 is an apocalyptic number.

It is an amenable number.

28814547881 is a deficient number, since it is larger than the sum of its proper divisors (4116363991).

28814547881 is an equidigital number, since it uses as much as digits as its factorization.

28814547881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116363990.

The product of its digits is 4587520, while the sum is 56.

The spelling of 28814547881 in words is "twenty-eight billion, eight hundred fourteen million, five hundred forty-seven thousand, eight hundred eighty-one".