64464312440 has 32 divisors (see below), whose sum is σ = 158230586160. Its totient is φ = 23441568000.

The previous prime is 64464312421. The next prime is 64464312467. The reversal of 64464312440 is 4421346446.

64464312440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64464312394 and 64464312403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73254461 + ... + 73255340.

Almost surely, 2^64464312440 is an apocalyptic number.

It is an amenable number.

64464312440 is an abundant number, since it is smaller than the sum of its proper divisors (93766273720).

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

64464312440 is a wasteful number, since it uses less digits than its factorization.

64464312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146509823 (or 146509819 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

Adding to 64464312440 its reverse (4421346446), we get a palindrome (68885658886).

The spelling of 64464312440 in words is "sixty-four billion, four hundred sixty-four million, three hundred twelve thousand, four hundred forty".