6405571378 has 8 divisors (see below), whose sum is σ = 9729982080. Its totient is φ = 3162244020.

The previous prime is 6405571363. The next prime is 6405571379. The reversal of 6405571378 is 8731755046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6405571379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20270638 + ... + 20270953.

It is an arithmetic number, because the mean of its divisors is an integer number (1216247760).

Almost surely, 2^6405571378 is an apocalyptic number.

6405571378 is a deficient number, since it is larger than the sum of its proper divisors (3324410702).

6405571378 is a wasteful number, since it uses less digits than its factorization.

6405571378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40541672.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 6405571378 is about 80034.8135376100. The cubic root of 6405571378 is about 1857.1741281446.

The spelling of 6405571378 in words is "six billion, four hundred five million, five hundred seventy-one thousand, three hundred seventy-eight".