6405785864 has 16 divisors (see below), whose sum is σ = 12049976400. Its totient is φ = 3192458832.

The previous prime is 6405785851. The next prime is 6405785879. The reversal of 6405785864 is 4685875046.

It is a happy number.

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, 1301654 + ... + 1306565.

It is an arithmetic number, because the mean of its divisors is an integer number (753123525).

Almost surely, 2^6405785864 is an apocalyptic number.

It is an amenable number.

6405785864 is a deficient number, since it is larger than the sum of its proper divisors (5644190536).

6405785864 is a wasteful number, since it uses less digits than its factorization.

6405785864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608532 (or 2608528 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 53.

The square root of 6405785864 is about 80036.1534807864. The cubic root of 6405785864 is about 1857.1948566314.

The spelling of 6405785864 in words is "six billion, four hundred five million, seven hundred eighty-five thousand, eight hundred sixty-four".