819780683870 has 32 divisors (see below), whose sum is σ = 1507123888128. Its totient is φ = 320909264928.

The previous prime is 819780683837. The next prime is 819780683899. The reversal of 819780683870 is 78386087918.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 819780683797 and 819780683806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6312209 + ... + 6440771.

It is an arithmetic number, because the mean of its divisors is an integer number (47097621504).

Almost surely, 2^819780683870 is an apocalyptic number.

819780683870 is a deficient number, since it is larger than the sum of its proper divisors (687343204258).

819780683870 is a wasteful number, since it uses less digits than its factorization.

819780683870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142184.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 819780683870 in words is "eight hundred nineteen billion, seven hundred eighty million, six hundred eighty-three thousand, eight hundred seventy".