24728349681 has 32 divisors (see below), whose sum is σ = 41893754880. Its totient is φ = 14121829008.

The previous prime is 24728349673. The next prime is 24728349703. The reversal of 24728349681 is 18694382742.

24728349681 is a `hidden beast` number, since 2 + 4 + 72 + 8 + 3 + 496 + 81 = 666.

It is not a de Polignac number, because 24728349681 - 2³ = 24728349673 is a prime.

It is a super-2 number, since 2×24728349681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (24728349631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275820 + ... + 354306.

It is an arithmetic number, because the mean of its divisors is an integer number (1309179840).

Almost surely, 2^24728349681 is an apocalyptic number.

24728349681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

24728349681 is a deficient number, since it is larger than the sum of its proper divisors (17165405199).

24728349681 is a wasteful number, since it uses less digits than its factorization.

24728349681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80170 (or 80164 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 24728349681 in words is "twenty-four billion, seven hundred twenty-eight million, three hundred forty-nine thousand, six hundred eighty-one".