6427936378 has 4 divisors (see below), whose sum is σ = 9641904570. Its totient is φ = 3213968188.

The previous prime is 6427936369. The next prime is 6427936393. The reversal of 6427936378 is 8736397246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5585021289 + 842915089 = 74733^2 + 29033^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1606984093 + ... + 1606984096.

Almost surely, 2^6427936378 is an apocalyptic number.

6427936378 is a deficient number, since it is larger than the sum of its proper divisors (3213968192).

6427936378 is a wasteful number, since it uses less digits than its factorization.

6427936378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213968191.

The product of its digits is 9144576, while the sum is 55.

The square root of 6427936378 is about 80174.4122398163. The cubic root of 6427936378 is about 1859.3330535529. Note that the first 3 decimals are identical.

The spelling of 6427936378 in words is "six billion, four hundred twenty-seven million, nine hundred thirty-six thousand, three hundred seventy-eight".