24680643138 has 30 divisors (see below), whose sum is σ = 55307403459. Its totient is φ = 8226214524.

The previous prime is 24680643137. The next prime is 24680643217. The reversal of 24680643138 is 83134608642.

It can be written as a sum of positive squares in only one way, i.e., 12340321569 + 12340321569 = 111087^2 + 111087^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=111087.

It is a junction number, because it is equal to n+sod(n) for n = 24680643093 and 24680643102.

It is not an unprimeable number, because it can be changed into a prime (24680643137) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1993395 + ... + 2005737.

Almost surely, 2^24680643138 is an apocalyptic number.

24680643138 is an abundant number, since it is smaller than the sum of its proper divisors (30626760321).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

24680643138 is an frugal number, since it uses more digits than its factorization.

24680643138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24700 (or 12348 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 24680643138 in words is "twenty-four billion, six hundred eighty million, six hundred forty-three thousand, one hundred thirty-eight".