8681138649 has 48 divisors (see below), whose sum is σ = 13083732480. Its totient is φ = 5542318080.

The previous prime is 8681138633. The next prime is 8681138671. The reversal of 8681138649 is 9468311868.

It is not a de Polignac number, because 8681138649 - 2⁴ = 8681138633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8681138595 and 8681138604.

It is not an unprimeable number, because it can be changed into a prime (8681138629) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5625372 + ... + 5626914.

It is an arithmetic number, because the mean of its divisors is an integer number (272577760).

Almost surely, 2^8681138649 is an apocalyptic number.

It is an amenable number.

8681138649 is a deficient number, since it is larger than the sum of its proper divisors (4402593831).

8681138649 is a wasteful number, since it uses less digits than its factorization.

8681138649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1859 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 8681138649 is about 93172.6282177336. The cubic root of 8681138649 is about 2055.2227446054. Note that the first 3 decimals are identical.

The spelling of 8681138649 in words is "eight billion, six hundred eighty-one million, one hundred thirty-eight thousand, six hundred forty-nine".