8928620981 has 16 divisors (see below), whose sum is σ = 10385817600. Its totient is φ = 7517063088.

The previous prime is 8928620977. The next prime is 8928620989. The reversal of 8928620981 is 1890268298.

It is a cyclic number.

It is not a de Polignac number, because 8928620981 - 2² = 8928620977 is a prime.

It is a super-2 number, since 2×8928620981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8928620989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519776 + ... + 536678.

It is an arithmetic number, because the mean of its divisors is an integer number (649113600).

Almost surely, 2^8928620981 is an apocalyptic number.

It is an amenable number.

8928620981 is a deficient number, since it is larger than the sum of its proper divisors (1457196619).

8928620981 is a wasteful number, since it uses less digits than its factorization.

8928620981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18248.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 8928620981 is about 94491.3804587487. The cubic root of 8928620981 is about 2074.5701712677.

The spelling of 8928620981 in words is "eight billion, nine hundred twenty-eight million, six hundred twenty thousand, nine hundred eighty-one".