28532743681 has 8 divisors (see below), whose sum is σ = 30731718080. Its totient is φ = 26334361872.

The previous prime is 28532743649. The next prime is 28532743699. The reversal of 28532743681 is 18634723582.

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

It is not a de Polignac number, because 28532743681 - 2⁵ = 28532743649 is a prime.

It is a super-2 number, since 2×28532743681² (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 (28532746681) 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, 45501 + ... + 243178.

It is an arithmetic number, because the mean of its divisors is an integer number (3841464760).

Almost surely, 2^28532743681 is an apocalyptic number.

It is an amenable number.

28532743681 is a deficient number, since it is larger than the sum of its proper divisors (2198974399).

28532743681 is a wasteful number, since it uses less digits than its factorization.

28532743681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296295.

The product of its digits is 1935360, while the sum is 49.

The spelling of 28532743681 in words is "twenty-eight billion, five hundred thirty-two million, seven hundred forty-three thousand, six hundred eighty-one".