8642929781 has 16 divisors (see below), whose sum is σ = 9061797888. Its totient is φ = 8235150000.

The previous prime is 8642929721. The next prime is 8642929807. The reversal of 8642929781 is 1879292468.

It is a cyclic number.

It is not a de Polignac number, because 8642929781 - 2¹⁴ = 8642913397 is a prime.

It is a super-2 number, since 2×8642929781² (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 (8642929721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621656 + ... + 635406.

It is an arithmetic number, because the mean of its divisors is an integer number (566362368).

Almost surely, 2^8642929781 is an apocalyptic number.

It is an amenable number.

8642929781 is a deficient number, since it is larger than the sum of its proper divisors (418868107).

8642929781 is a wasteful number, since it uses less digits than its factorization.

8642929781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14152.

The product of its digits is 3483648, while the sum is 56.

The square root of 8642929781 is about 92967.3586857237. The cubic root of 8642929781 is about 2052.2030475340.

The spelling of 8642929781 in words is "eight billion, six hundred forty-two million, nine hundred twenty-nine thousand, seven hundred eighty-one".