8942679781 has 12 divisors (see below), whose sum is σ = 10656436140. Its totient is φ = 7478197440.

The previous prime is 8942679773. The next prime is 8942679793. The reversal of 8942679781 is 1879762498.

It can be written as a sum of positive squares in 2 ways, for example, as 3907500100 + 5035179681 = 62510^2 + 70959^2 .

It is not a de Polignac number, because 8942679781 - 2³ = 8942679773 is a prime.

It is a super-2 number, since 2×8942679781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8942679721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2223646 + ... + 2227663.

It is an arithmetic number, because the mean of its divisors is an integer number (888036345).

Almost surely, 2^8942679781 is an apocalyptic number.

It is an amenable number.

8942679781 is a deficient number, since it is larger than the sum of its proper divisors (1713756359).

8942679781 is a wasteful number, since it uses less digits than its factorization.

8942679781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451364 (or 4451357 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 61.

The square root of 8942679781 is about 94565.7431684434. The cubic root of 8942679781 is about 2075.6584570005.

The spelling of 8942679781 in words is "eight billion, nine hundred forty-two million, six hundred seventy-nine thousand, seven hundred eighty-one".