6827817978 has 12 divisors (see below), whose sum is σ = 14793605658. Its totient is φ = 2275939320.

The previous prime is 6827817959. The next prime is 6827817989. The reversal of 6827817978 is 8797187286.

It can be written as a sum of positive squares in only one way, i.e., 6008885289 + 818932689 = 77517^2 + 28617^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189661593 + ... + 189661628.

Almost surely, 2^6827817978 is an apocalyptic number.

6827817978 is an abundant number, since it is smaller than the sum of its proper divisors (7965787680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6827817978 is a wasteful number, since it uses less digits than its factorization.

6827817978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379323229 (or 379323226 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 63.

The square root of 6827817978 is about 82630.6116278949. The cubic root of 6827817978 is about 1897.1163994099.

The spelling of 6827817978 in words is "six billion, eight hundred twenty-seven million, eight hundred seventeen thousand, nine hundred seventy-eight".