28455981361 has 4 divisors (see below), whose sum is σ = 28456370800. Its totient is φ = 28455591924.

The previous prime is 28455981353. The next prime is 28455981383. The reversal of 28455981361 is 16318955482.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16318955482 = 2 ⋅8159477741.

It is a cyclic number.

It is not a de Polignac number, because 28455981361 - 2³ = 28455981353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28455981299 and 28455981308.

It is not an unprimeable number, because it can be changed into a prime (28455981331) 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, 48531 + ... + 243448.

It is an arithmetic number, because the mean of its divisors is an integer number (7114092700).

Almost surely, 2^28455981361 is an apocalyptic number.

It is an amenable number.

28455981361 is a deficient number, since it is larger than the sum of its proper divisors (389439).

28455981361 is an equidigital number, since it uses as much as digits as its factorization.

28455981361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389438.

The product of its digits is 2073600, while the sum is 52.

The spelling of 28455981361 in words is "twenty-eight billion, four hundred fifty-five million, nine hundred eighty-one thousand, three hundred sixty-one".