28363351681 has 8 divisors (see below), whose sum is σ = 32518824704. Its totient is φ = 24233770080.

The previous prime is 28363351663. The next prime is 28363351691. The reversal of 28363351681 is 18615336382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28363351681 - 2¹¹ = 28363349633 is a prime.

It is a super-2 number, since 2×28363351681² (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 (28363351631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6470505 + ... + 6474886.

It is an arithmetic number, because the mean of its divisors is an integer number (4064853088).

Almost surely, 2^28363351681 is an apocalyptic number.

It is an amenable number.

28363351681 is a deficient number, since it is larger than the sum of its proper divisors (4155473023).

28363351681 is a wasteful number, since it uses less digits than its factorization.

28363351681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12945711.

The product of its digits is 622080, while the sum is 46.

The spelling of 28363351681 in words is "twenty-eight billion, three hundred sixty-three million, three hundred fifty-one thousand, six hundred eighty-one".