6400864144 has 10 divisors (see below), whose sum is σ = 12401674310. Its totient is φ = 3200432064.

The previous prime is 6400864121. The next prime is 6400864231. The reversal of 6400864144 is 4414680046.

It can be written as a sum of positive squares in only one way, i.e., 5703270400 + 697593744 = 75520^2 + 26412^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200026989 + ... + 200027020.

It is an arithmetic number, because the mean of its divisors is an integer number (1240167431).

Almost surely, 2^6400864144 is an apocalyptic number.

It is an amenable number.

6400864144 is a deficient number, since it is larger than the sum of its proper divisors (6000810166).

6400864144 is a wasteful number, since it uses less digits than its factorization.

6400864144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400054017 (or 400054011 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 6400864144 is about 80005.4007177016. The cubic root of 6400864144 is about 1856.7190922082.

The spelling of 6400864144 in words is "six billion, four hundred million, eight hundred sixty-four thousand, one hundred forty-four".