8628138981 has 48 divisors (see below), whose sum is σ = 16221142080. Its totient is φ = 4482142560.

The previous prime is 8628138973. The next prime is 8628138997. The reversal of 8628138981 is 1898318268.

8628138981 is a `hidden beast` number, since 8 + 628 + 1 + 3 + 8 + 9 + 8 + 1 = 666.

8628138981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8628138981 - 2³ = 8628138973 is a prime.

It is a super-2 number, since 2×8628138981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8628138941) 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, 281886 + ... + 310991.

It is an arithmetic number, because the mean of its divisors is an integer number (337940460).

Almost surely, 2^8628138981 is an apocalyptic number.

It is an amenable number.

8628138981 is a deficient number, since it is larger than the sum of its proper divisors (7593003099).

8628138981 is a wasteful number, since it uses less digits than its factorization.

8628138981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592911 (or 592898 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 8628138981 is about 92887.7762733074. The cubic root of 8628138981 is about 2051.0317218746.

The spelling of 8628138981 in words is "eight billion, six hundred twenty-eight million, one hundred thirty-eight thousand, nine hundred eighty-one".