64244464640 has 44 divisors (see below), whose sum is σ = 154111440936. Its totient is φ = 25697783808.

The previous prime is 64244464621. The next prime is 64244464649. The reversal of 64244464640 is 4646444246.

It is a happy number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64244464591 and 64244464600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64244464649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6268754 + ... + 6278993.

Almost surely, 2^64244464640 is an apocalyptic number.

It is an amenable number.

64244464640 is an abundant number, since it is smaller than the sum of its proper divisors (89866976296).

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

64244464640 is a wasteful number, since it uses less digits than its factorization.

64244464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12547772 (or 12547754 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 64244464640 in words is "sixty-four billion, two hundred forty-four million, four hundred sixty-four thousand, six hundred forty".