28049603681 has 8 divisors (see below), whose sum is σ = 30629906400. Its totient is φ = 25474357440.

The previous prime is 28049603671. The next prime is 28049603683. The reversal of 28049603681 is 18630694082.

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 28049603681 - 2²² = 28045409377 is a prime.

It is a super-2 number, since 2×28049603681² (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 (28049603683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1252511 + ... + 1274708.

It is an arithmetic number, because the mean of its divisors is an integer number (3828738300).

Almost surely, 2^28049603681 is an apocalyptic number.

It is an amenable number.

28049603681 is a deficient number, since it is larger than the sum of its proper divisors (2580302719).

28049603681 is a wasteful number, since it uses less digits than its factorization.

28049603681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528239.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 28049603681 in words is "twenty-eight billion, forty-nine million, six hundred three thousand, six hundred eighty-one".