28671754681 has 4 divisors (see below), whose sum is σ = 28672245364. Its totient is φ = 28671264000.

The previous prime is 28671754633. The next prime is 28671754687. The reversal of 28671754681 is 18645717682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12480464656 + 16191290025 = 111716^2 + 127245^2 .

It is a cyclic number.

It is not a de Polignac number, because 28671754681 - 2⁹ = 28671754169 is a prime.

It is a super-2 number, since 2×28671754681² (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 (28671754687) 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, 143640 + ... + 279241.

It is an arithmetic number, because the mean of its divisors is an integer number (7168061341).

Almost surely, 2^28671754681 is an apocalyptic number.

It is an amenable number.

28671754681 is a deficient number, since it is larger than the sum of its proper divisors (490683).

28671754681 is an equidigital number, since it uses as much as digits as its factorization.

28671754681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490682.

The product of its digits is 4515840, while the sum is 55.

The spelling of 28671754681 in words is "twenty-eight billion, six hundred seventy-one million, seven hundred fifty-four thousand, six hundred eighty-one".