686736636428 has 6 divisors (see below), whose sum is σ = 1201789113756. Its totient is φ = 343368318212.

The previous prime is 686736636349. The next prime is 686736636499. The reversal of 686736636428 is 824636637686.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85842079550 + ... + 85842079557.

It is an arithmetic number, because the mean of its divisors is an integer number (200298185626).

Almost surely, 2^686736636428 is an apocalyptic number.

It is an amenable number.

686736636428 is a deficient number, since it is larger than the sum of its proper divisors (515052477328).

686736636428 is a wasteful number, since it uses less digits than its factorization.

686736636428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171684159111 (or 171684159109 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 65.

The spelling of 686736636428 in words is "six hundred eighty-six billion, seven hundred thirty-six million, six hundred thirty-six thousand, four hundred twenty-eight".