787857431686 has 12 divisors (see below), whose sum is σ = 1279685592252. Its totient is φ = 363626506776.

The previous prime is 787857431681. The next prime is 787857431707. The reversal of 787857431686 is 686134758787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787857431681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1165469236 + ... + 1165469911.

It is an arithmetic number, because the mean of its divisors is an integer number (106640466021).

Almost surely, 2^787857431686 is an apocalyptic number.

787857431686 is a deficient number, since it is larger than the sum of its proper divisors (491828160566).

787857431686 is a wasteful number, since it uses less digits than its factorization.

787857431686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330939175 (or 2330939162 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 70.

The spelling of 787857431686 in words is "seven hundred eighty-seven billion, eight hundred fifty-seven million, four hundred thirty-one thousand, six hundred eighty-six".