6923781790864 has 15 divisors (see below), whose sum is σ = 13414847612467. Its totient is φ = 3461885632816.

The previous prime is 6923781790853. The next prime is 6923781790897. The reversal of 6923781790864 is 4680971873296.

It is a happy number.

The square root of 6923781790864 is 2631308.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6923781790793 and 6923781790802.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10196319 + ... + 10854145.

Almost surely, 2^{6923781790864} is an apocalyptic number.

6923781790864 is the 2631308-th square number.

It is an amenable number.

6923781790864 is a deficient number, since it is larger than the sum of its proper divisors (6491065821603).

6923781790864 is an frugal number, since it uses more digits than its factorization.

6923781790864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315662 (or 657829 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 6923781790864 in words is "six trillion, nine hundred twenty-three billion, seven hundred eighty-one million, seven hundred ninety thousand, eight hundred sixty-four".