64231605440 has 56 divisors (see below), whose sum is σ = 153619596240. Its totient is φ = 25580418048.

The previous prime is 64231605433. The next prime is 64231605467. The reversal of 64231605440 is 4450613246.

It is a self number, because there is not a number n which added to its sum of digits gives 64231605440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364982 + ... + 511541.

Almost surely, 2^64231605440 is an apocalyptic number.

It is an amenable number.

64231605440 is an abundant number, since it is smaller than the sum of its proper divisors (89387990800).

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

64231605440 is a wasteful number, since it uses less digits than its factorization.

64231605440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876769 (or 876759 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 64231605440 in words is "sixty-four billion, two hundred thirty-one million, six hundred five thousand, four hundred forty".