64513048440 has 128 divisors (see below), whose sum is σ = 196583996160. Its totient is φ = 16933238784.

The previous prime is 64513048423. The next prime is 64513048459. The reversal of 64513048440 is 4484031546.

It is a congruent number.

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, 13850592 + ... + 13855248.

It is an arithmetic number, because the mean of its divisors is an integer number (1535812470).

Almost surely, 2^64513048440 is an apocalyptic number.

64513048440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64513048440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98291998080).

64513048440 is an abundant number, since it is smaller than the sum of its proper divisors (132070947720).

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

64513048440 is a wasteful number, since it uses less digits than its factorization.

64513048440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461 (or 6457 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

Adding to 64513048440 its reverse (4484031546), we get a palindrome (68997079986).

The spelling of 64513048440 in words is "sixty-four billion, five hundred thirteen million, forty-eight thousand, four hundred forty".