64341640 has 64 divisors (see below), whose sum is σ = 158760000. Its totient is φ = 23274240.

The previous prime is 64341623. The next prime is 64341643. The reversal of 64341640 is 4614346.

It is a happy number.

64341640 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 = 64341599 and 64341608.

It is not an unprimeable number, because it can be changed into a prime (64341643) 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 15 ways as a sum of consecutive naturals, for example, 153351 + ... + 153769.

It is an arithmetic number, because the mean of its divisors is an integer number (2480625).

Almost surely, 2^64341640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64341640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79380000).

64341640 is an abundant number, since it is smaller than the sum of its proper divisors (94418360).

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

64341640 is a wasteful number, since it uses less digits than its factorization.

64341640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 64341640 is about 8021.3240802252. The cubic root of 64341640 is about 400.7104872724.

Adding to 64341640 its reverse (4614346), we get a palindrome (68955986).

The spelling of 64341640 in words is "sixty-four million, three hundred forty-one thousand, six hundred forty".