6378545 has 4 divisors (see below), whose sum is σ = 7654260. Its totient is φ = 5102832.

The previous prime is 6378517. The next prime is 6378551. The reversal of 6378545 is 5458736.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1934881 + 4443664 = 1391^2 + 2108^2 .

It is a cyclic number.

It is not a de Polignac number, because 6378545 - 2¹⁶ = 6313009 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6378499 and 6378508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637850 + ... + 637859.

It is an arithmetic number, because the mean of its divisors is an integer number (1913565).

Almost surely, 2^6378545 is an apocalyptic number.

It is an amenable number.

6378545 is a deficient number, since it is larger than the sum of its proper divisors (1275715).

6378545 is a wasteful number, since it uses less digits than its factorization.

6378545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275714.

The product of its digits is 100800, while the sum is 38.

The square root of 6378545 is about 2525.5781516318. The cubic root of 6378545 is about 185.4558517247.

The spelling of 6378545 in words is "six million, three hundred seventy-eight thousand, five hundred forty-five".