6440464905 has 32 divisors (see below), whose sum is σ = 11781206784. Its totient is φ = 2943123456.

The previous prime is 6440464873. The next prime is 6440464963. The reversal of 6440464905 is 5094640446.

It is not a de Polignac number, because 6440464905 - 2⁵ = 6440464873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319609 + ... + 339161.

It is an arithmetic number, because the mean of its divisors is an integer number (368162712).

Almost surely, 2^6440464905 is an apocalyptic number.

It is an amenable number.

6440464905 is a deficient number, since it is larger than the sum of its proper divisors (5340741879).

6440464905 is a wasteful number, since it uses less digits than its factorization.

6440464905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22705.

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 6440464905 is about 80252.5071570976. The cubic root of 6440464905 is about 1860.5402624708.

The spelling of 6440464905 in words is "six billion, four hundred forty million, four hundred sixty-four thousand, nine hundred five".