8291686861928 has 8 divisors (see below), whose sum is σ = 15546912866130. Its totient is φ = 4145843430960.

The previous prime is 8291686861907. The next prime is 8291686861981.

It is a happy number.

8291686861928 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 8068337992324 + 223348869604 = 2840482^2 + 472598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 518230428863 + ... + 518230428878.

Almost surely, 2^{8291686861928} is an apocalyptic number.

It is an amenable number.

8291686861928 is a deficient number, since it is larger than the sum of its proper divisors (7255226004202).

8291686861928 is a wasteful number, since it uses less digits than its factorization.

8291686861928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036460857747 (or 1036460857743 counting only the distinct ones).

The product of its digits is 286654464, while the sum is 74.

The spelling of 8291686861928 in words is "eight trillion, two hundred ninety-one billion, six hundred eighty-six million, eight hundred sixty-one thousand, nine hundred twenty-eight".