64009727440 has 20 divisors (see below), whose sum is σ = 148822616484. Its totient is φ = 25603890944.

The previous prime is 64009727429. The next prime is 64009727491. The reversal of 64009727440 is 4472790046.

It can be written as a sum of positive squares in 2 ways, for example, as 49259139136 + 14750588304 = 221944^2 + 121452^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent 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, 400060717 + ... + 400060876.

Almost surely, 2^64009727440 is an apocalyptic number.

It is an amenable number.

64009727440 is an abundant number, since it is smaller than the sum of its proper divisors (84812889044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64009727440 is a wasteful number, since it uses less digits than its factorization.

64009727440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800121606 (or 800121600 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 64009727440 in words is "sixty-four billion, nine million, seven hundred twenty-seven thousand, four hundred forty".