64464640 has 36 divisors (see below), whose sum is σ = 154416024. Its totient is φ = 25785344.

The previous prime is 64464613. The next prime is 64464641. The reversal of 64464640 is 4646446.

64464640 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 = 64464596 and 64464605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64464641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 23902 + ... + 26461.

It is an arithmetic number, because the mean of its divisors is an integer number (4289334).

Almost surely, 2^64464640 is an apocalyptic number.

It is an amenable number.

64464640 is an abundant number, since it is smaller than the sum of its proper divisors (89951384).

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

64464640 is an equidigital number, since it uses as much as digits as its factorization.

64464640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50384 (or 50370 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 64464640 is about 8028.9874828648. The cubic root of 64464640 is about 400.9656668428.

The spelling of 64464640 in words is "sixty-four million, four hundred sixty-four thousand, six hundred forty".