6905478778 has 16 divisors (see below), whose sum is σ = 11964573504. Its totient is φ = 2954215360.

The previous prime is 6905478763. The next prime is 6905478779. The reversal of 6905478778 is 8778745096.

It is not an unprimeable number, because it can be changed into a prime (6905478779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9231550 + ... + 9232297.

It is an arithmetic number, because the mean of its divisors is an integer number (747785844).

Almost surely, 2^6905478778 is an apocalyptic number.

6905478778 is a deficient number, since it is larger than the sum of its proper divisors (5059094726).

6905478778 is a wasteful number, since it uses less digits than its factorization.

6905478778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18463877.

The product of its (nonzero) digits is 23708160, while the sum is 61.

The square root of 6905478778 is about 83099.2104535296. The cubic root of 6905478778 is about 1904.2820116741.

The spelling of 6905478778 in words is "six billion, nine hundred five million, four hundred seventy-eight thousand, seven hundred seventy-eight".